Tag: KS3

📚 KS3 Activate 2 Science Revision: Core Concepts and Exam Skills | KS3 Activate 2 科学复习：核心概念与考试技巧

Welcome to this KS3 Activate 2 revision guide. It brings together the key ideas from the Activate 2 course, including health, ecosystems, chemistry, Earth science, electricity, and motion. Each section pairs an English explanation with a Chinese translation so you can check your understanding and build scientific vocabulary.

欢迎使用本 KS3 Activate 2 复习指南。它汇集了 Activate 2 课程中的核心概念，包括健康、生态系统、化学、地球科学、电学和运动。每一节都提供英文解释和中文对照，帮助你检查理解并积累科学词汇。

1. Working Scientifically | 科学探究方法

In every Activate 2 topic, you need to plan investigations, collect data, and draw conclusions. The independent variable is the one you change, the dependent variable is the one you measure, and control variables are kept the same to make the test fair.

在 Activate 2 的每个主题中，你都需要设计探究、收集数据并得出结论。自变量是你改变的变量，因变量是你测量的变量，控制变量则保持不变以确保实验公平。

When plotting a graph, put the independent variable on the x-axis and the dependent variable on the y-axis. Use a line of best fit only when the data show a clear trend; never join every point with a ruler if the points are scattered.

绘制图表时，将自变量放在 x 轴，因变量放在 y 轴。只有数据呈现明显趋势时才使用最佳拟合线；如果点分散，不要用直尺连接每一个点。

A scientific conclusion must refer back to the data. Say whether the results support the prediction, and describe the relationship in words such as ‘as the independent variable increases, the dependent variable decreases’.

科学结论必须回到数据本身。要说明结果是否支持预测，并用语言描述关系，例如“随着自变量增大，因变量减小”。

In exam questions on working scientifically, look for clues about variables in the method. Always identify what is changed, what is measured, and what is kept constant before evaluating the quality of the data.

在科学探究方法的考题中，留意方法中关于变量的线索。在评价数据质量之前，始终先找清哪些是被改变的变量、哪些是被测量的变量、哪些是保持不变的变量。

2. Health and Lifestyle | 健康与生活方式

Health is not simply the absence of disease; it is a state of physical and mental wellbeing. In Activate 2, you study how nutrients, exercise, and drugs affect the body. Carbohydrates, proteins, and fats provide energy and building materials, while vitamins and minerals are needed in small amounts.

健康不仅仅是没有疾病；它是一种身体和心理的良好状态。在 Activate 2 中，你会学习营养素、运动和药物如何影响身体。碳水化合物、蛋白质和脂肪提供能量和构建材料，而维生素和矿物质需要量很小。

Digestion breaks large insoluble molecules into small soluble ones. Enzymes in the mouth, stomach, and small intestine speed up these reactions. The small intestine is where most absorption into the blood occurs.

消化将大分子不溶性物质分解为小分子可溶性物质。口腔、胃和小肠中的酶加速这些反应。小肠是大多数营养物质被吸收进入血液的地方。

Common exam questions ask you to interpret food tests or model gut data. Remember: Benedict’s solution tests for reducing sugars, iodine tests for starch, and Biuret reagent tests for protein.

常见考题要求你解释食物测试或模拟肠道数据。记住：本尼迪克特溶液检测还原糖，碘液检测淀粉，双缩脲试剂检测蛋白质。

Lifestyle choices, such as smoking, poor diet, and lack of exercise, increase the risk of non-communicable diseases like heart disease and type 2 diabetes. These diseases cannot be passed from person to person.

生活方式的选择，如吸烟、不良饮食和缺乏运动，会增加患心脏病和 2 型糖尿病等非传染性疾病的风险。这些疾病不会在人与人之间传播。

3. Ecosystem Processes | 生态系统过程

Photosynthesis is the process by which green plants make glucose using light energy. The word equation is:

光合作用是绿色植物利用光能制造葡萄糖的过程。文字方程式为：

carbon dioxide + water → glucose + oxygen

二氧化碳 + 水 → 葡萄糖 + 氧气

Photosynthesis happens in chloroplasts, which contain chlorophyll. The rate is affected by light intensity, carbon dioxide concentration, and temperature.

光合作用发生在含有叶绿素的叶绿体中。光合作用速率受光照强度、二氧化碳浓度和温度的影响。

Aerobic respiration releases energy from glucose in the mitochondria of all living cells. Its word equation is:

有氧呼吸在所有活细胞的线粒体中将葡萄糖中的能量释放出来。其文字方程式为：

glucose + oxygen → carbon dioxide + water

葡萄糖 + 氧气 → 二氧化碳 + 水

Food chains show the transfer of energy from producers to consumers. Arrows point in the direction of energy flow, not in the direction of ‘who eats whom’.

食物链显示能量从生产者到消费者的传递。箭头指向能量流动的方向，而不是“谁吃谁”的方向。

A common misconception is that plants only respire at night. In fact, plants respire all the time, but during the day photosynthesis usually produces more oxygen than respiration uses.

一个常见的误区是植物只在夜间呼吸。事实上，植物时刻都在呼吸，但在白天光合作用产生的氧气通常多于呼吸作用消耗的氧气。

4. Adaptation and Inheritance | 适应与遗传

Organisms have adaptations that help them survive in their environment. For example, camels have wide feet to spread their weight on sand, and cacti have thick stems to store water.

生物体具有帮助它们在环境中生存的适应性特征。例如，骆驼有宽大的脚掌以分散在沙地上的重量，仙人掌有粗厚的茎来储存水分。

Natural selection explains how species change over time. Individuals with advantageous traits are more likely to survive and reproduce, passing those traits to their offspring.

自然选择解释了物种如何随着时间发生变化。具有有利特征的个体更有可能生存和繁殖，并将这些特征传给后代。

Genetic information is carried by DNA in the nucleus. A gene is a section of DNA that controls a characteristic. In KS3, you do not need the full structure of DNA, but you should know that genes are passed from parents to offspring during reproduction.

遗传信息由细胞核中的 DNA 携带。基因是控制某一特征的 DNA 片段。在 KS3 阶段，你不需要掌握 DNA 的完整结构，但应该知道基因在生殖过程中由父母传给后代。

Variation within a species can be caused by genetic factors, environmental factors, or a combination of both. For example, height is influenced by genes and by diet.

物种内部的变异可能由遗传因素、环境因素或两者共同引起。例如，身高既受基因影响，也受饮食影响。

5. The Periodic Table | 元素周期表

All substances are made from elements. An element contains only one type of atom. Compounds form when two or more different elements chemically combine, such as water (H₂O) and carbon dioxide (CO₂).

所有物质都由元素组成。元素只含有一种原子。当两种或多种不同元素发生化学结合时形成化合物，例如水（H₂O）和二氧化碳（CO₂）。

The Periodic Table arranges elements in order of increasing atomic number. Metals are on the left and in the centre, while non-metals are on the right. Group 1 elements are the alkali metals, Group 7 are the halogens, and Group 0 are the noble gases.

元素周期表按原子序数递增的顺序排列元素。金属位于左侧和中间，非金属位于右侧。第 1 族是碱金属，第 7 族是卤素，第 0 族是稀有气体。

Chemical reactions can be represented by word equations. Reactants go on the left, products on the right, and an arrow shows the direction of change. No atoms are lost or made, so the total mass is conserved.

化学反应可用文字方程式表示。反应物写在左边，产物写在右边，箭头表示变化方向。原子不会消失或产生，因此总质量守恒。

When you see a chemical formula such as CO₂, the subscript 2 tells you there are two oxygen atoms in one molecule. If there is no subscript, there is only one atom of that element.

当你看到 CO₂ 这样的化学式时，下标 2 表示一个分子中有两个氧原子。如果没有下标，则表示该元素只有一个原子。

6. Separation Techniques | 分离技术

Mixtures contain two or more substances that are not chemically joined. Unlike compounds, the parts of a mixture can be separated by physical methods because each substance keeps its own properties.

混合物含有两种或多种没有化学结合的物质。与化合物不同，混合物的各组分可以通过物理方法分离，因为每种物质保持自身的性质。

This table summarises the four main separation techniques you need to describe and choose in exam questions. Always link the method to the properties of the substances in the mixture.

该表总结了你在考试中需要描述和选择的四种主要分离技术。始终将方法与混合物中各物质的性质联系起来。

For example, filtration is used to separate sand from water because sand is insoluble. Distillation is better than evaporation when you need to collect the liquid as well as the solid.

例如，过滤用于分离沙子和水，因为沙子不溶于水。当你既需要收集液体又需要收集固体时，蒸馏比蒸发更合适。

7. Metals and Acids | 金属与酸

Metals react with acids to produce a salt and hydrogen

Published by TutorHao | KS3 Revision Series | aleveler.com

更多咨询请联系16621398022（同微信）

📚 KS3 Activate 1 Science: Core Concepts and Skills | KS3 Activate 1 科学：核心概念与技能

This revision article covers the core ideas in the Oxford KS3 Science Activate 1 student book by Philippa Gardom Hulme, Jo Locke and Helen Reynolds. It follows the CIE KS3 curriculum and is intended to help you review key concepts, practise scientific vocabulary and prepare for end-of-topic tests.

本文复习 Oxford KS3 Science Activate 1 学生用书（Philippa Gardom Hulme、Jo Locke 与 Helen Reynolds 著）的核心内容，对应 CIE KS3 课程要求，帮助学生梳理关键概念、熟悉科学术语并准备单元测验。

1. Working Scientifically | 科学探究方法

Working scientifically is about asking questions, designing fair tests and using evidence. The independent variable is the one you change, the dependent variable is the one you measure, and control variables are kept the same to make the test fair.

科学探究包括提出问题、设计公平实验和运用证据。自变量是实验中主动改变的量，因变量是测量的量，控制变量则保持不变，以保证实验公平。

When recording data, use a table with headings and units. Repeat readings improve reliability, and an anomalous result is one that does not fit the pattern. In a graph, plot the independent variable on the x-axis and the dependent variable on the y-axis.

记录数据时应使用带标题和单位的表格。重复测量可以提高可靠性，异常值是明显偏离整体规律的数据。绘图时，将自变量标在 x 轴，因变量标在 y 轴。

Always follow safety rules: wear eye protection, stand up during practical work, and never taste chemicals. Use a Bunsen burner on a heat-proof mat and open the air hole only when a blue flame is needed.

实验时必须遵守安全规则：佩戴护目镜、实验时站立、绝不品尝化学药品。使用本生灯时放在隔热垫上，仅在需要蓝色火焰时打开气孔。

2. Cells and Microscopes | 细胞与显微镜

All living organisms are made of cells. Animal cells contain a nucleus, cytoplasm, cell membrane and mitochondria. Plant cells have the same parts plus a cell wall, a large permanent vacuole and chloroplasts, which absorb light for photosynthesis.

所有生物都由细胞构成。动物细胞含有细胞核、细胞质、细胞膜和线粒体。植物细胞除了这些结构外，还有细胞壁、大液泡和叶绿体，叶绿体吸收光能进行光合作用。

A microscope magnifies small objects. Total magnification = eyepiece lens magnification × objective lens magnification. For example, a ×10 eyepiece and a ×40 objective give ×400 magnification.

显微镜可以放大微小物体。总放大倍数 = 目镜放大倍数 × 物镜放大倍数。例如，10 倍目镜和 40 倍物镜的总放大倍数为 400 倍。

total magnification = eyepiece magnification × objective magnification

To prepare a slide, place a thin specimen on a glass slide, add a drop of water or stain such as iodine, and lower a coverslip slowly to avoid air bubbles.

制作装片时，将薄的材料放在载玻片上，滴加一滴水或碘液等染液，然后缓慢放下盖玻片，避免产生气泡。

3. Structure and Function of Body Systems | 人体系统的结构与功能

Cells are organised into tissues, tissues into organs, and organs into organ systems. For example, muscle cells form muscle tissue, which makes up the heart, an organ in the circulatory system.

细胞组成组织，组织组成器官，器官组成器官系统。例如，肌细胞构成肌肉组织，肌肉组织构成心脏，心脏是循环系统的器官。

The respiratory system takes in oxygen and removes carbon dioxide. Air travels through the trachea, bronchi and bronchioles to the alveoli, where gas exchange happens with the blood.

呼吸系统吸入氧气并排出二氧化碳。空气依次经过气管、支气管和细支气管到达肺泡，肺泡与血液进行气体交换。

The digestive system breaks down large food molecules into small soluble molecules. The small intestine is the main site of absorption into the blood.

消化系统将大分子食物分解为小分子可溶性物质。小肠是营养物质吸收进入血液的主要场所。

4. Reproduction in Humans and Plants | 人类与植物的生殖

In humans, the male reproductive system produces sperm in the testes, while the female reproductive system releases egg cells from the ovaries. Fertilisation occurs when a sperm nucleus fuses with an egg nucleus in the oviduct.

人类男性生殖系统在睾丸中产生精子，女性生殖系统从卵巢排出卵细胞。当精子的细胞核与卵细胞核在输卵管中融合时，发生受精。

The fertilised egg implants in the uterus and develops into a foetus. The placenta allows oxygen and nutrients to pass from the mother’s blood to the foetus, and waste to pass back.

受精卵在子宫内着床并发育成胎儿。胎盘使氧气和营养物质从母体血液传递给胎儿，并将废物传回母体。

In flowering plants, pollen is made in the anther and transferred to the stigma during pollination. After fertilisation, the ovary becomes a fruit and the ovules become seeds.

在开花植物中，花粉在花药中产生，传粉时传到柱头上。受精后，子房发育成果实，胚珠发育成种子。

5. Particles and Their Behaviour | 粒子及其行为

The particle model describes matter as tiny particles that are always moving. In solids, particles vibrate in fixed positions; in liquids, they move around each other; in gases, they move freely and fill their container.

粒子模型将物质描述为不断运动的微小粒子。固体中粒子在固定位置振动；液体中粒子可以相对滑动；气体中粒子自由运动并充满容器。

Changes of state include melting, freezing, boiling, evaporating, condensing and subliming. During a change of state, the temperature stays the same because energy is used to break or form bonds between particles, not to raise the temperature.

物态变化包括熔化、凝固、沸腾、蒸发、冷凝和升华。物态变化过程中温度保持不变，因为能量用于破坏或形成粒子间的键，而不是升高温度。

Diffusion is the movement of particles from a region of higher concentration to a region of lower concentration. It happens fastest in gases and slowest in solids.

扩散是粒子从高浓度区域向低浓度区域运动的过程。扩散在气体中最快，在固体中最慢。

6. Elements, Atoms and Compounds | 元素、原子与化合物

An element contains only one type of atom. The periodic table lists all known elements, each with a chemical symbol. Many symbols are one or two letters, such as H for hydrogen, O for oxygen and Fe for iron.

元素只含有一种原子。元素周期表列出了所有已知元素，每种元素有一个化学符号。符号通常为一个或两个字母，如 H 代表氢，O 代表氧，Fe 代表铁。

Atoms can join together to form molecules. A compound contains two or more different elements chemically bonded together. For example, water (H₂O) contains hydrogen and oxygen atoms, and carbon dioxide (CO₂) contains carbon and oxygen.

原子可以结合形成分子。化合物由两种或多种不同元素通过化学键结合而成。例如，水 (H₂O) 含有氢原子和氧原子，二氧化碳 (CO₂) 含有碳原子和氧原子。

A mixture contains different substances that are not chemically bonded, so they can be separated by physical methods such as filtration, evaporation or distillation.

混合物包含的不是化学键结合的不同物质，因此可以通过过滤、蒸发或蒸馏等物理方法进行分离。

7. Chemical Reactions | 化学反应

A chemical reaction forms new substances. Signs of a reaction include colour change, gas bubbles, precipitate formation, and energy change as heat or light.

化学反应生成新物质。反应现象包括颜色变化、产生气泡、生成沉淀以及以热或光形式出现的能量变化。

Word equations show reactants on the left and products on the right, with an arrow in between. For example: magnesium + oxygen → magnesium oxide.

文字表达式左侧写反应物，右侧写生成物，中间用箭头连接。例如：镁 + 氧气 →

Published by TutorHao | KS3 Revision Series | aleveler.com

更多咨询请联系16621398022（同微信）

📚 Activate 1 Intervention Workbook: Targeted KS3 Science Support | Activate 1 干预练习册：KS3 科学定向巩固

The Activate 1 Intervention Workbook is a focused resource for KS3 science students who need to consolidate foundational ideas before moving on to higher-level content. It breaks down the Activate 1 course into small, manageable steps and gives students repeated practice with core concepts in biology, chemistry and physics. Many teachers use it in intervention sessions, catch-up lessons or as homework for targeted support.

Activate 1 干预练习册是一本面向 KS3 科学学生的专项资源，帮助他们在进入更高层次内容之前巩固基础知识。它把 Activate 1 课程拆分成小而可控的步骤，让学生反复练习生物学、化学和物理中的核心概念。许多教师在干预课、补差课或家庭作业中使用它来进行定向辅导。

1. What the Workbook Covers | 练习册涵盖的内容

The workbook maps closely onto the Activate 1 Student Book. It revisits the core learning objectives from B1, C1 and P1 units, but presents them in shorter chunks with more scaffolding. This makes it suitable for students who found the main lessons too fast or too dense.

练习册与 Activate 1 学生用书紧密对应。它重新呈现 B1、C1 和 P1 单元的核心学习目标，但用更短的模块和更多支架来讲解。这适合觉得主课进度太快或内容太密的学生。

• B1 Cells (细胞) — plant and animal cell structure, specialised cells, diffusion
• B1 Body systems (身体系统) — skeleton, muscles, breathing, digestion
• C1 Particles (粒子) — particle model, states of matter, changing state
• C1 Elements and atoms (元素与原子) — elements, compounds, chemical reactions
• P1 Forces (力) — balanced and unbalanced forces, speed, friction
• P1 Sound and light (声音与光) — waves, reflection, hearing

2. How to Use the Workbook for Intervention | 如何在干预辅导中使用练习册

Start with the workbook’s knowledge check at the beginning of each topic. It helps identify exactly which idea has not been secured. Then complete the guided practice before attempting independent questions.

从每个主题开头的知识检查开始。它能帮助确定哪个知识点尚未掌握。然后完成引导练习，再尝试独立题目。

Teachers can use the traffic-light self-assessment boxes to ask students to mark their confidence before and after each section. This makes progress visible in a short intervention session.

教师可以利用交通灯自我评估框，让学生在每节前后标记自己的信心程度。这样在短暂的干预课中也能看到进步。

3. B1 Cells: Building Blocks of Life | B1 细胞：生命的构建块

The workbook covers the differences between animal and plant cells. Students practise labelling the nucleus, cytoplasm, cell membrane, cell wall, chloroplasts and vacuole. They also compare the functions of these parts.

练习册涵盖动物细胞和植物细胞的区别。学生练习标注细胞核、细胞质、细胞膜、细胞壁、叶绿体和液泡，并比较这些部分的功能。

Diffusion is introduced as the movement of particles from a region of high concentration to low concentration. Everyday examples include oxygen entering the blood and carbon dioxide leaving a leaf.

扩散被介绍为粒子从高浓度区域向低浓度区域移动。日常例子包括氧气进入血液和二氧化碳离开叶片。

4. B1 Body Systems: From Cells to Organisms | B1 身体系统：从细胞到生物体

This section helps students arrange biological organisation: cells → tissues → organs → organ systems → organism. It revisits the skeleton, joints, muscles, breathing and digestion as examples of systems working together.

本部分帮助学生排列生物组织层次：细胞 → 组织 → 器官 → 器官系统 → 生物体。它复习骨骼、关节、肌肉、呼吸和消化等系统共同工作的例子。

Key practice includes drawing simple flow diagrams for inhaling and exhaling, and matching organs to their functions in the digestive system.

关键练习包括绘制吸气和呼气的简单流程图，以及将消化系统中的器官与其功能配对。

5. C1 Particles: The Particle Model | C1 粒子：粒子模型

The particle model is central to chemistry. The workbook reinforces the arrangement and movement of particles in solids, liquids and gases. Students learn that particles are always moving, even in solids.

粒子模型是化学的核心。练习册巩固固体、液体和气体中粒子的排列与运动。学生学到粒子总是在运动，即使在固体中也是如此。

Changing state is explained using energy. Melting, freezing, boiling and condensing are linked to particle behaviour, not to changing the particles themselves.

状态变化用能量来解释。熔化、凝固、沸腾和凝结与粒子行为有关，而不是改变粒子本身。

6. C1 Elements, Atoms and Compounds | C1 元素、原子和化合物

Students learn that an element contains only one type of atom, while a compound contains two or more different elements chemically joined. The workbook practises recognising elements and compounds from diagrams and formulas.

学生学到元素只含一种原子，而化合物含有两种或更多不同元素化学结合。练习册训练从图和化学式中识别元素和化合物。

Simple word equations are introduced, such as magnesium + oxygen → magnesium oxide. Subscripts are used carefully: H₂O has two hydrogen atoms and one oxygen atom.

引入简单的文字表达式，如镁 + 氧气 → 氧化镁。下标使用很仔细：H₂O 有两个氢原子和一个氧原子。

7. P1 Forces and Motion | P1 力与运动

The workbook covers contact and non-contact forces, balanced and unbalanced forces, and the effect of forces on motion. Students practise drawing force arrows to show direction and relative size.

练习册涵盖接触力和非接触力、平衡与不平衡力，以及力对运动的影响。学生练习画力的箭头来表示方向和相对大小。

Speed is calculated using speed = distance ÷ time. The workbook provides simple numeric practice with units such as metres per second (m/s).

速度用 速度 = 距离 ÷ 时间 计算。练习册提供简单的数字练习，单位如米每秒（m/s）。

8. P1 Sound and Light | P1 声音与光

This section reinforces that sound is produced by vibrations and travels as a wave. Light travels in straight lines and can be reflected. Students label the parts of the ear and the eye.

本部分巩固声音由振动产生并以波的形式传播。光沿直线传播并可被反射。学生标注耳朵和眼睛的各个部分。

Common tasks include drawing ray diagrams for reflection and comparing the speed of sound and light in everyday situations, such as lightning before thunder.

常见任务包括绘制反射的光路图，以及比较日常现象中声音和光的速度，例如闪电先于雷声。

9. Working Scientifically in the Workbook | 练习册中的科学探究技能

Intervention is not only about content. The workbook includes key skills such as identifying variables, reading scales, recording data in tables and drawing bar charts or line graphs.

干预辅导不只是知识内容。练习册包括关键技能，如识别变量、读取刻度、在表格中记录数据以及绘制条形图或折线图。

Students are asked to evaluate whether a test was fair and to suggest improvements. This builds confidence for required practical work in later stages.

学生被要求评价一个实验是否公平，并提出改进建议。这为后续阶段的必做实验建立信心。

10. Self-Assessment and Progress Tracking | 自我评估与进度追踪

Each section ends with a short ‘check your progress’ box. Students tick statements such as ‘I can label the parts of a plant cell’ or ‘I can calculate speed.’ This supports metacognition.

每节末尾有简短的 ‘检查你的进步’ 框。学生勾选诸如 ‘我能标注植物细胞的各部分’ 或 ‘我能计算速度’ 等陈述。这支持元认知。

Teachers and parents can use these boxes to plan the next session. If a student ticks only some statements, those unticked become the next teaching point.

教师和家长可以利用这些框来计划下一次辅导。如果学生只勾选部分陈述，未勾选的部分就成为下一个教学点。

11. Common Misconceptions and Corrections | 常见迷思概念与纠正

The workbook directly addresses common errors. For example, many students think that particles expand when a solid is heated. The correct idea is that particles vibrate more and take up more space, but the particles themselves do not expand.

练习册直接处理常见错误。例如，许多学生认为固体受热时粒子膨胀。正确的理解是粒子振动加剧并占据更多空间，但粒子本身不会膨胀。

Another misconception is that a force is needed to keep an object moving. The workbook uses balanced force diagrams to show that steady motion can happen with balanced forces.

另一个迷思是物体运动需要力来维持。练习册用平衡力图表示，在平衡力下物体可以保持匀速运动。

12. From Intervention to Independent Learning | 从干预辅导到自主学习

The ultimate goal is for students to return to the main Activate 1 course with increased confidence. After completing the workbook, they should be able to attempt higher-tier questions without relying on constant teacher prompts.

最终目标是让学生带着更强的信心回到 Activate 1 主课程。完成练习册后，他们应该能够在不过度依赖教师提示的情况下尝试更高层次的题目。

A good routine is to reattempt the knowledge check at the end of each unit. If the score improves, the intervention has worked. If not, revisit the weakest section before moving on.

一个好的习惯是在每个单元结束时重新做知识检查。如果分数提高，说明干预有效。如果没有提高，则在进入下一单元前重温最薄弱的部分。

Published by TutorHao | KS3 Science Revision Series | aleveler.com

更多咨询请联系16621398022（同微信）

📚 KS3 CIE Year 8 Waves Scheme of Work | KS3 CIE 八年级波教学计划

In Year 8, the CIE lower secondary science course introduces waves as one of the key ways in which energy travels. This scheme of work helps you understand how sound and light behave, how we describe waves with measurable quantities, and how our ears and eyes detect them.

在八年级，CIE初中科学课程将波作为能量传播的重要方式之一进行介绍。本教学计划帮助你理解声音和光的行为，如何用可测量的量来描述波，以及我们的耳朵和眼睛如何探测它们。

1. What is a Wave? | 什么是波？

A wave is a disturbance that transfers energy from one place to another without transferring matter. Waves are produced by vibrations.

波是一种扰动，它将能量从一个地方传递到另一个地方，而不传递物质。波由振动产生。

In a wave, particles of the medium may move up and down or backwards and forwards, but they always return to their original positions after the wave has passed.

在波中，介质的粒子可能上下或前后运动，但波经过后它们总是回到原来的位置。

Examples include water waves, sound waves, light waves and seismic waves from earthquakes.

例子包括水波、声波、光波和地震产生的地震波。

2. Transverse and Longitudinal Waves | 横波与纵波

In a transverse wave, the vibrations are perpendicular to the direction of energy transfer. Light waves and water waves are transverse.

在横波中，振动方向与能量传递方向垂直。光波和水波是横波。

In a longitudinal wave, the vibrations are parallel to the direction of energy transfer. Sound waves are longitudinal, consisting of compressions and rarefactions.

在纵波中，振动方向与能量传递方向平行。声波是纵波，由压缩和稀疏组成。

You can remember the difference by thinking of a transverse wave like a wave on a rope, while a longitudinal wave is like a stretched spring pushed and pulled along its length.

你可以通过联想来记住区别：横波像绳子上的波，而纵波像沿长度方向推拉的弹簧。

3. Describing Waves: Amplitude, Wavelength and Frequency | 描述波：振幅、波长和频率

The amplitude of a wave is the maximum displacement of a particle from its rest position. It is related to the energy carried by the wave: a larger amplitude means more energy.

波的振幅是粒子离开其平衡位置的最大位移。它与波携带的能量有关：振幅越大，能量越多。

The wavelength is the distance between two consecutive crests or two consecutive compressions. It is measured in metres.

波长是两个相邻波峰或两个相邻压缩之间的距离。它以米为单位。

The frequency is the number of complete waves passing a point per second. It is measured in hertz (Hz).

频率是每秒通过某一点的完整波的数量。它以赫兹（Hz）为单位。

4. Wave Speed, Frequency and Wavelength | 波速、频率与波长

Wave speed, frequency and wavelength are linked by the equation:

波速、频率和波长之间的关系由以下方程表示：

v = f × λ

where v is wave speed in metres per second (m/s), f is frequency in hertz (Hz), and λ is wavelength in metres (m).

其中 v 是以米每秒（m/s）表示的波速，f 是以赫兹（Hz）表示的频率，λ 是以米（m）表示的波长。

You can rearrange this equation to find frequency or wavelength: f = v ÷ λ and λ = v ÷ f.

你可以重新整理这个方程来求频率或波长：f = v ÷ λ 和 λ = v ÷ f。

Example: a sound wave has frequency 250 Hz and wavelength 1.36 m. Its speed is v = 250 × 1.36 = 340 m/s.

例如：一个声波的频率为 250 Hz，波长为 1.36 m。它的速度是 v = 250 × 1.36 = 340 m/s。

5. Sound as a Longitudinal Wave | 声音是一种纵波

Sound is produced by vibrating objects, such as vocal cords, loudspeaker cones or guitar strings. These vibrations create longitudinal waves in the air.

声音由振动的物体产生，例如声带、扬声器纸盆或吉他弦。这些振动在空气中产生纵波。

Sound cannot travel through a vacuum because there are no particles to vibrate and pass on the energy. This is why astronauts need radios to communicate in space.

声音不能在真空中传播，因为没有粒子可以振动并传递能量。这就是为什么宇航员在太空中需要无线电来通讯。

Sound travels at different speeds in different media. It travels faster in solids and liquids than in gases because the particles are closer together.

声音在不同介质中的传播速度不同。它在固体和液体中比在气体中传播得更快，因为粒子之间的距离更近。

6. Light as a Transverse Wave | 光是一种横波

Light is a transverse wave and can travel through a vacuum. The speed of light in a vacuum is about 300,000,000 m/s (3 × 10⁸ m/s).

光是一种横波，可以在真空中传播。光在真空中的速度约为 300,000,000 米/秒（3 × 10⁸ 米/秒）。

Light travels much faster than sound, which is why you see lightning before you hear thunder.

光的传播速度比声音快得多，这就是为什么你先看到闪电后听到雷声。

Light waves can be reflected, refracted and absorbed by different materials, and these effects explain many everyday observations.

光波可以被不同材料反射、折射和吸收，这些效应解释了许多日常现象。

7. Reflection of Waves | 波的反射

Reflection occurs when a wave bounces off a surface. For light, the law of reflection states that the angle of incidence equals the angle of reflection.

当波从表面反弹时会发生反射。对于光，反射定律指出入射角等于反射角。

The normal is an imaginary line drawn at right angles to the surface at the point where the wave hits. Angles are measured between the ray and the normal.

法线是一条想象中垂直于表面、画在波入射点的线。角度是在光线和法线之间测量的。

Smooth, shiny surfaces such as mirrors give regular reflection, while rough surfaces give diffuse reflection, which is why you cannot see a clear image in paper.

光滑、有光泽的表面（如镜子）产生规则反射，而粗糙表面产生漫反射，这就是为什么你在纸上看不到清晰的像。

8. Refraction of Light | 光的折射

Refraction is the bending of light as it passes from one transparent material to another, such as from air into glass or water. This happens because light changes speed in different media.

折射是光从一种透明材料进入另一种透明材料（例如从空气进入玻璃或水）时发生的弯曲。这是因为光在不同介质中速度发生变化。

When light enters a denser medium, it slows down and bends towards the normal. When it enters a less dense medium, it speeds up and bends away from the normal.

当光进入较密的介质时，速度减慢并向法线弯曲。当它进入较疏的介质时，速度加快并远离法线弯曲。

Refraction explains why a straw in a glass of water appears bent or broken at the water surface.

折射解释了为什么水杯中的吸管在水面处看起来弯曲或折断。

9. Dispersion and Colour | 色散与颜色

White light is a mixture of all the colours of the visible spectrum. When white light passes through a prism, it splits into red, orange, yellow, green, blue, indigo and violet. This effect is called dispersion.

白光是可见光谱中所有颜色的混合。当白光通过棱镜时，它会分成红、橙、黄、绿、蓝、靛、紫。这种效应称为色散。

Dispersion occurs because each colour has a slightly different wavelength and is refracted by a different amount. Red light is refracted the least, and violet light is refracted the most.

色散的发生是因为每种颜色的波长略有不同，折射程度也不同。红光的折射最少，紫光的折射最多。

A rainbow is a natural example of dispersion, caused by sunlight passing through raindrops.

彩虹是色散的自然例子，由太阳光穿过雨滴引起。

10. The Ear and Hearing | 耳朵与听觉

The ear detects sound waves and converts them into electrical signals that the brain interprets. The main parts are the outer ear, ear canal, eardrum, ossicles, cochlea and auditory nerve.

耳朵探测声波并将其转化为大脑解读的电信号。主要部分包括外耳、耳道、鼓膜、听小骨、耳蜗和听觉神经。

Sound waves make the eardrum vibrate. These vibrations are passed through the ossicles to the cochlea, where tiny hair cells send signals along the auditory nerve to the brain.

声波使鼓膜振动。这些振动通过听小骨传递到耳蜗，在耳蜗中微小的毛细胞沿听觉神经向大脑发送信号。

Loud sounds can damage the hair cells in the cochlea, leading to permanent hearing loss, so ear protection is important in noisy environments.

响亮的声音会损伤耳蜗中的毛细胞，导致永久性听力损失，因此在嘈杂环境中保护耳朵很重要。

11. The Eye and Seeing | 眼睛与视觉

The eye detects light and focuses it to form an image. Key parts are the cornea, pupil, iris, lens, retina and optic nerve.

眼睛探测光并将其聚焦以形成图像。关键部分包括角膜、瞳孔、虹膜、晶状体、视网膜和视神经。

Light enters the eye through the cornea and pupil. The lens focuses light onto the retina, where light-sensitive cells create signals that travel along the optic nerve to the brain.

光通过角膜和瞳孔进入眼睛。晶状体将光聚焦到视网膜上，视网膜上的感光细胞产生信号，沿视神经传递到大脑。

The iris controls the size of the pupil to let in the right amount of light. In bright light the pupil shrinks; in dim light it widens.

虹膜控制瞳孔的大小，以让适量的光进入。在强光下瞳孔缩小；在弱光下瞳孔扩大。

12. Waves in Context: Energy Transfer without Matter Transfer | 波的情境：能量传递而不传递物质

All waves transfer energy from a source to a receiver without transferring matter. A floating object on a water wave bobs up and down but does not travel forward with the wave.

所有波都将能量从源传递到接收器，而不传递物质。漂浮在水波上的物体上下浮动，但不会随波向前移动。

This idea is important in applications such as ultrasound, seismic monitoring, and communication systems, which all depend on the behaviour of waves.

这一概念在超声、地震监测和通信系统等应用中非常重要，它们都依赖于波的行为。

In the Year 8 waves scheme of work, students should be able to describe, compare and calculate wave properties, and explain sound and light phenomena using scientific ideas.

在八年级波的教学计划中，学生应能够描述、比较和计算波的性质，并用科学概念解释声音和光现象。

Published by TutorHao | Physics Revision Series | aleveler.com

更多咨询请联系16621398022（同微信）

📚 KS3 CIE Revision of Light Answers | KS3 CIE 光复习答案

This revision guide gives clear, exam-style answers for the KS3 CIE topic of light. It covers how light travels, reflects, refracts, disperses, and how we see objects and colour. Use each section to check your understanding and correct common mistakes.

这份复习指南为 KS3 CIE 光学专题提供清晰的考试风格答案。它涵盖光的传播、反射、折射、色散，以及我们如何看到物体和颜色。使用每一节来检查你的理解并纠正常见错误。

1. Light Travels in Straight Lines | 光沿直线传播

Light is a form of energy that travels in straight lines called rays. A ray is drawn as a straight arrow showing the direction of travel. A beam is made of many rays.

光是一种能量形式，沿直线传播，这些直线称为光线。光线用带箭头的直线表示，箭头指示传播方向。光束由许多光线组成。

We can see a light ray only when it enters the eye. In diagrams, always draw rays with a ruler and mark the direction with an arrow. The arrow must point from the light source towards the eye, not the other way.

只有当光线进入眼睛时，我们才能看到它。在示意图中，一定要用尺子画光线，并用箭头标出方向。箭头必须从光源指向眼睛，而不是相反。

Light travels at about 300,000,000 m/s in a vacuum. In air, its speed is almost the same. In water and glass, light travels more slowly, which helps explain refraction later.

光在真空中的速度约为 300,000,000 米/秒。在空气中速度几乎相同。在水中和玻璃中，光传播得更慢，这有助于解释后面的折射现象。

2. Shadows, Eclipses and the Pinhole Camera | 影子、日食月食与针孔照相机

A shadow forms when an opaque object blocks light. Because light travels in straight lines, the shadow has a similar shape to the object. Translucent objects let some light through, so they make weak shadows. Transparent objects let almost all light through, so they do not form clear shadows.

当不透明物体阻挡光时，就会形成影子。因为光沿直线传播，影子的形状与物体相似。半透明物体让部分光通过，所以形成较淡的影子。透明物体几乎让所有光通过，因此不会形成清晰的影子。

An eclipse is a shadow in space. A solar eclipse happens when the Moon blocks sunlight from reaching part of the Earth. A lunar eclipse happens when the Earth blocks sunlight from reaching the Moon.

日食或月食是太空中的影子。日食发生在月球挡住太阳光，使其无法到达地球部分地区时。月食发生在地球挡住太阳光，使其无法到达月球时。

A pinhole camera uses a tiny hole to form an upside-down image on a screen. The image is real and inverted because light rays from the top of the object pass through the hole and end up at the bottom of the screen.

针孔照相机利用小孔在屏幕上形成倒立的像。像是实像且倒立，因为物体顶部的光线穿过小孔后到达屏幕底部。

If the pinhole is made smaller, the image becomes sharper but dimmer. If the screen is moved further from the pinhole, the image becomes larger but dimmer.

如果针孔变小，图像会变得更清晰但更暗。如果屏幕离针孔更远，图像会变大但更暗。

3. Reflection from a Plane Mirror | 平面镜的反射

Reflection happens when light bounces off a surface. A plane mirror is a flat, smooth surface that reflects light regularly. This gives a clear image.

当光从表面反弹时，就发生了反射。平面镜是一个平整光滑的表面，能有规律地反射光，因此形成清晰的像。

The image in a plane mirror is upright, the same size as the object, and appears to be the same distance behind the mirror as the object is in front. The image is laterally inverted, which means left and right appear swapped.

平面镜中的像是正立的，与物体大小相同，并且看起来在镜后的距离与物体在镜前的距离相等。像是左右颠倒的，也就是左右看起来互换。

The image in a plane mirror is virtual. A virtual image cannot be projected onto a screen because the light rays do not actually pass through the image position; they only appear to come from behind the mirror.

平面镜中的像是虚像。虚像不能投射到屏幕上，因为光线实际上并没有通过像的位置；它们只是看起来从镜后发出。

4. The Law of Reflection | 反射定律

The law of reflection states that the angle of incidence equals the angle of reflection. Both angles are measured from the normal, not from the mirror surface.

反射定律指出，入射角等于反射角。两个角都从法线测量，而不是从镜面测量。

The normal is an imaginary line drawn at 90 degrees to the surface at the point where the ray hits. The incident ray is the incoming ray, and the reflected ray is the outgoing ray.

法线是一条假想的线，在光线照射点处与表面成 90 度。入射光线是射入的光线，反射光线是射出的光线。

angle of incidence i = angle of reflection r

入射角 i = 反射角 r

For a ray hitting a plane mirror at 30 degrees to the mirror surface, the angle of incidence is not 30 degrees. Calculate it as 90 – 30 = 50 degrees. So the angle of reflection is also 50 degrees.

如果光线以与镜面成 30 度角射向平面镜，入射角不是 30 度。应计算为 90 – 30 = 50 度。因此反射角也是 50 度。

5. Refraction: Light Bending at Boundaries | 折射：光在界面处的弯曲

Refraction is the change in direction of light when it passes from one transparent material to another, such as from air into glass or water. It happens because light changes speed.

折射是光从一种透明材料进入另一种透明材料时方向的改变，例如从空气进入玻璃或水中。它发生的原因是光的速度发生了改变。

When light enters a denser medium like glass from air, it slows down and bends towards the normal. When light leaves the denser medium and enters air, it speeds up and bends away from the normal.

当光从空气进入玻璃等更密的介质时，速度减慢并向法线方向偏折。当光离开较密介质进入空气时，速度加快并偏离法线方向。

If a ray hits the boundary exactly along the normal, it passes straight through without bending. The angle of incidence is 0 degrees, so the angle of refraction is also 0 degrees.

如果光线正好沿法线射入界面，它会直直穿过而不发生偏折。入射角为 0 度，因此折射角也为 0 度。

A common example is a straw in a glass of water. The straw looks bent or broken at the water surface because light from the underwater part changes direction when it leaves the water and enters the air.

一个常见的例子是水杯中的吸管。吸管在水面处看起来弯曲或折断，因为来自水下部分的光在离开水进入空气时改变了方向。

6. Dispersion and the Visible Spectrum | 色散与可见光谱

White light is a mixture of different colours. When white light passes through a triangular glass prism, it splits into the colours of the visible spectrum. This splitting is called dispersion.

白光是不同颜色的混合体。当白光穿过三棱镜时，它会被分解成可见光谱的各种颜色。这种分解称为色散。

The colours of the visible spectrum in order are red, orange, yellow, green, blue, indigo and violet. A useful memory phrase is ‘Richard Of York Gave Battle In Vain’.

可见光谱的颜色顺序是红、橙、黄、绿、蓝、靛、紫。一个有用的记忆短语是 ‘Richard Of York Gave Battle In Vain’。

Dispersion happens because each colour has a slightly different speed inside glass. Red light slows down the least and is bent the least. Violet light slows down the most and is bent the most.

色散发生的原因是每种颜色在玻璃中的速度略有不同。红光减慢得最少，偏折也最少。紫光减慢得最多，偏折也最多。

A rainbow is an example of dispersion. Water droplets in the air act like tiny prisms, splitting sunlight into its colours.

彩虹是色散的一个例子。空气中的水滴像小棱镜一样，把太阳光分解成各种颜色。

7. How We See Colour | 我们如何看到颜色

We see objects because light reflects off them and enters our eyes. The colour of an object depends on which colours of light it reflects and which colours it absorbs.

我们能看到物体，是因为光从物体反射并进入我们的眼睛。物体的颜色取决于它反射哪些颜色的光以及吸收哪些颜色的光。

A red apple looks red in white light because it reflects red light and absorbs the other colours. A white shirt looks white because it reflects all colours of the spectrum. A black object looks black because it absorbs nearly all colours and reflects very little.

一个红苹果在白光下看起来是红色，因为它反射红光并吸收其他颜色。白衬衫看起来是白色，因为它反射光谱中的所有颜色。黑色物体看起来是黑色，因为它几乎吸收所有颜色，反射很少的光。

Colour filters work by transmitting only some colours and absorbing others. A red filter lets red light through and absorbs other colours. If you shine pure green light through a red filter, almost no light passes, so the filter appears black.

彩色滤光片的工作原理是只透射某些颜色并吸收其他颜色。红色滤光片让红光通过并吸收其他颜色。如果用纯绿光照射红色滤光片，几乎没有光通过，因此滤光片看起来是黑色。

If an object is viewed in coloured light, its appearance can change. A blue object in red light looks black because there is no blue light to reflect. A white object in green light looks green because it reflects green light.

如果物体在彩色光下观察，它的外观可能会改变。蓝色物体在红光下看起来是黑色，因为没有蓝光可以反射。白色物体在绿光下看起来是绿色，因为它反射绿光。

8. Lenses and the Human Eye | 透镜与人眼

A convex lens is thicker in the middle than at the edges. It converges light rays to a focus. The distance from the centre of the lens to the focus is called the focal length.

凸透镜中间比边缘厚。它使光线会聚到焦点。从透镜中心到焦点的距离称为焦距。

A convex lens can form real and inverted images on a screen. If the object is far away, the image is smaller. If the object is close but beyond the focus, the image can be larger and inverted.

凸透镜可以在屏幕上形成倒立的实像。如果物体较远，像较小。如果物体较近但在焦点之外，像可以更大且倒立。

The eye contains a convex lens that focuses light onto the retina. The retina is a light-sensitive layer at the back of the eye. The image on the retina is real, inverted and smaller than the object. The brain interprets this image as upright.

眼睛含有一个凸透镜，将光聚焦到视网膜上。视网膜是眼球后部的感光层。视网膜上的像是实像、倒立且比物体小。大脑将这个像解读为正立。

The iris controls how much light enters the eye through the pupil. In bright light, the pupil becomes smaller. In dim light, the pupil becomes larger. The cornea also helps focus light before it passes through the lens.

虹膜控制通过瞳孔进入眼睛的光量。在强光下，瞳孔变小。在弱光下，瞳孔变大。角膜在光通过晶状体之前也有助于聚焦光线。

9. Key Measurements and Units | 关键测量与单位

When answering exam questions on light, always name the correct equipment and state the correct unit. Angles are measured in degrees using a protractor.

在回答光学考试题时，一定要写出正确的器材和单位。角度用量角器测量，单位是度。

To investigate reflection, place a plane mirror on a sheet of paper. Draw the incident ray, the normal and the reflected ray. Use a protractor to measure the angle between each ray and the normal. Repeat for different incident angles.

要研究反射，将平面镜放在一张纸上。画出入射光线、法线和反射光线。用量角器测量每条光线与法线之间的夹角。对不同的入射角重复实验。

For refraction, use a glass block or water tank. Shine a ray of light at the surface and mark the path of the ray before and after the block. Draw the normal at each boundary and measure the angles of incidence and refraction.

对于折射，使用玻璃块或水槽。将一束光照在表面上，并在玻璃块前后标出光线的路径。在每个界面处画出法线，测量入射角和折射角。

The speed of light is not usually measured in KS3 labs because it is extremely fast. Instead, you may be asked to recall its approximate value: 3 × 10⁸ m/s.

光速通常不在 KS3 实验室中测量，因为它极快。相反，你可能会被要求记住它的近似值：3 × 10⁸ m/s。

10. Common Misconceptions and Exam Answers | 常见误区与考试答案

A very common mistake is to think that we see objects because the eye sends out rays. The correct idea is that light reflects from the object into the eye. Check your ray diagrams carefully: the arrow must point towards the eye.

一个非常常见的错误是认为我们看到物体是因为眼睛发出光线。正确的概念是光从物体反射进入眼睛。仔细检查你的光线图：箭头必须指向眼睛。

Another misconception is that shadows are always completely black. In fact, shadows can have a dark central region called the umbra and a lighter outer region called the penumbra when the light source is large.

另一个误区是影子总是完全黑色的。事实上，当光源较大时，影子可以有一个较暗的中心区域称为本影，和一个较亮的外部区域称为半影。

Students sometimes say that in a mirror the image swaps left and right completely. It is better to say the image is laterally inverted. The mirror does not swap top and bottom.

学生有时说镜子中的像完全左右互换。更好的说法是像是左右颠倒的。镜子不会上下颠倒。

For refraction, do not say ‘light bends because it hits the glass’. The correct explanation is that light bends because it changes speed when it enters a different medium. If asked about direction, say towards the normal when slowing down, and away from the normal when speeding up.

对于折射，不要说 ‘光弯曲是因为它碰到了玻璃’。正确的解释是光弯曲是因为它进入不同介质时速度发生了变化。如果被问及方向，要说明减速时向法线偏折，加速时偏离法线。

For colour, do not say ‘a red object absorbs red light’. That is backwards. A red object reflects red light and absorbs the other colours.

对于颜色，不要说 ‘红色物体吸收红光’。那是反的。红色物体反射红光并吸收其他颜色。

11. Quick Practice Questions with Answers | 快速练习题与答案

Question 1: State the law of reflection.

问题 1：陈述反射定律。

Answer: The angle of incidence equals the angle of reflection, measured from the normal.

答案：入射角等于反射角，均从法线测量。

Question 2: A light ray hits a mirror. The angle between the incident ray and the mirror surface is 20 degrees. What is the angle of reflection?

问题 2：一束光照射到镜面。入射光线与镜面的夹角为 20 度。反射角是多少？

Answer: Angle of incidence = 90 – 20 = 70 degrees, so the angle of reflection is also 70 degrees.

答案：入射角 = 90 – 20 = 70 度，因此反射角也是 70 度。

Question 3: Why does a pencil look bent when placed in a glass of water?

问题 3：为什么铅笔放在水杯中看起来是弯的？

Answer: Light from the underwater part of the pencil refracts at the water-air surface. The rays change direction, so the pencil appears bent.

答案：来自铅笔水下部分的光在水与空气界面发生折射。光线改变方向，所以铅笔看起来弯曲。

Question 4: Name the colours of the visible spectrum in order.

问题 4：按顺序说出可见光谱的颜色。

Answer: Red, orange, yellow, green, blue, indigo, violet.

答案：红、橙、黄、绿、蓝、靛、紫。

Question 5: A blue object is viewed in red light. What colour does it appear? Explain.

问题 5：蓝色物体在红光下观察。它看起来是什么颜色？请解释。

Answer: It appears black because it can only reflect blue light. Red light contains no blue light, so the object reflects almost nothing.

答案：它看起来是黑色，因为它只能反射蓝光。红光不含蓝光，所以物体几乎不反射任何光。

12. Summary Checklist | 复习清单

• Light travels in straight lines and can be shown by rays with arrows.

  光沿直线传播，可以用带箭头的光线表示。

• Shadows, eclipses and pinhole camera images are explained by straight-line propagation.

  影子、日食月食和针孔照相机成像都可以用直线传播来解释。

• The law of reflection: angle of incidence equals angle of reflection, measured from the normal.

  反射定律：入射角等于反射角，从法线测量。

• Refraction is the bending of light due to a change in speed between media.

  折射是光由于在不同介质中速度改变而发生的弯曲。

• White light disperses into red, orange, yellow, green, blue, indigo and violet.

  白光色散为红、橙、黄、绿、蓝、靛、紫。

• Colour appearance depends on which wavelengths are reflected or transmitted.

  颜色外观取决于哪些波长的光被反射或透射。

• A convex lens focuses light; the eye uses a convex lens to form an inverted image on the retina.

  凸透镜会聚光线；眼睛利用凸透镜在视网膜上形成倒像。

• Always draw the normal and measure angles from it in reflection and refraction diagrams.

  在反射和折射图中，一定要画出法线并从法线测量角度。

Published by TutorHao | Physics Revision Series | aleveler.com

更多咨询请联系16621398022（同微信）

📚 KS3 CIE Light Crossword | KS3 CIE 光学填字复习

This bilingual revision guide turns the key ideas of KS3 CIE Light into a crossword-style review. Each section gives a clue, explains the science behind it, and then provides the answer. Use it to test yourself on the core vocabulary and ideas before your assessment.

这份双语复习指南将 KS3 CIE 光学主题的核心概念变成填字游戏式复习。每一节先给出线索，解释其背后的科学原理，再给出答案。你可以在评估前用它检测自己对核心词汇和概念的理解。

1. Light as a Form of Energy | 光是能量的一种形式

Light is a form of energy that travels in straight lines and can move through a vacuum. It does not need particles or a medium to carry it, which is why sunlight reaches Earth across empty space.

光是一种能量形式，沿直线传播，并且可以在真空中传播。它不需要粒子或介质来承载，因此阳光能够穿越空旷的太空到达地球。

We detect light with our eyes. Most objects do not give out light themselves; they are seen because light from a source bounces off them into our eyes.

我们用眼睛探测光。大多数物体本身不发光；我们看见它们是因为来自光源的光从物体表面反射进入眼睛。

Crossword clue: Form of energy detected by our eyes (5 letters). Answer: LIGHT.

填字线索：我们眼睛能探测到的能量形式（5 个字母）。答案：LIGHT。

2. Luminous and Non-luminous Objects | 发光体与不发光体

A luminous object produces its own light. The Sun, a lit candle, a torch bulb and a fire are all luminous sources. A non-luminous object does not produce light; it can only reflect light from a luminous source.

发光体能自己产生光。太阳、点燃的蜡烛、手电筒灯泡和火都是发光源。不发光体不产生光，只能反射来自发光体的光。

The Moon looks bright, but it is non-luminous. We see the Moon because sunlight reflects from its surface. A mirror is also non-luminous, yet it can appear very bright when it reflects light towards us.

月球看起来很亮，但它是不发光体。我们看到月球是因为阳光从它表面反射。镜子也是不发光体，但当它把光反射向我们时，会显得非常亮。

Crossword clue: Word meaning ‘gives out its own light’ (8 letters). Answer: LUMINOUS.

填字线索：意为 “自己发光” 的词（8 个字母）。答案：LUMINOUS。

3. Light Travels in Straight Lines | 光沿直线传播

Light travels in straight lines called rays. We draw a ray as a straight arrow that shows the direction of travel. A narrow beam of light, such as a laser beam, shows this clearly.

光沿直线传播，这些直线称为光线。我们用带箭头的直线表示光线，箭头表示传播方向。激光束等窄光束可以清楚地显示这一点。

Because light travels in straight lines, an opaque object blocks light and creates a shadow. A pinhole camera works because light from the top of an object passes through the pinhole and appears at the bottom of the screen.

由于光沿直线传播，不透明物体会阻挡光并形成影子。针孔照相机的工作原理是：物体顶部发出的光穿过小孔后到达屏幕底部。

Crossword clue: A narrow beam of light used in diagrams (3 letters). Answer: RAY.

填字线索：图中用来表示光的窄光束（3 个字母）。答案：RAY。

4. Reflection and the Law of Reflection | 反射与反射定律

Reflection happens when light bounces off a surface. A plane mirror gives a clear reflection because its surface is very smooth. Rough surfaces scatter light in many directions, so they do not form a clear image.

当光从表面反弹时发生反射。平面镜表面非常平滑，因此能产生清晰的反射。粗糙表面会把光散射到许多

Published by TutorHao | KS3 Revision Series | aleveler.com

更多咨询请联系16621398022（同微信）

📚 KS3 CIE Sound Wordsearch | KS3 CIE 声音单词搜索

Sound is one of the most familiar forms of energy in everyday life, yet many students find its wave behaviour tricky. This KS3 CIE revision article breaks down the key ideas behind sound waves, pitch, loudness, hearing and echoes. Each section includes a short bilingual explanation, and the final section provides a wordsearch challenge to help you lock in essential vocabulary.

声音是日常生活中最常见的能量形式之一，但许多学生觉得它的波动行为很难理解。这篇 KS3 CIE 复习文章分解了声音波、音调、响度、听觉和回声背后的关键概念。每一节都配有简短的中英双语讲解，最后一节还提供单词搜索挑战，帮助你牢记重要词汇。

1. What is Sound? | 声音是什么？

Sound is a form of energy produced by vibrating objects. When a guitar string, drum skin or vocal cord vibrates, it pushes nearby air particles backwards and forwards, creating a disturbance that moves away from the source.

声音是由物体振动产生的一种能量形式。当吉他弦、鼓面或声带振动时，会推动附近的空气粒子来回运动，形成从声源向外传播的扰动。

These vibrations travel through a medium as a wave. Sound waves are longitudinal waves, meaning the particles vibrate in the same direction as the wave travels.

这些振动以波的形式通过介质传播。声波是纵波，意思是粒子振动的方向与波传播的方向相同。

A simple demonstration is to touch a vibrating tuning fork to the surface of water. The water splashes, showing that the source is vibrating even when the vibration is too small to see.

一个简单的演示是把振动的音叉接触水面。水会溅起，表明声源在振动，即使振动小到肉眼看不见。

2. How Sound Travels | 声音如何传播

Sound travels when vibrating particles pass energy to neighbouring particles. In gases, the particles are far apart, so the wave moves by a series of compressions and rarefactions.

声音的传播依靠振动的粒子把能量传递给相邻粒子。在气体中，粒子相距较远，所以波通过一系列的压缩和稀疏区域向前传播。

Compressions are regions where particles are pushed together; rarefactions are regions where particles are spread apart. A sound wave is a repeating pattern of these two regions.

压缩是粒子被推挤到一起的区域；稀疏是粒子被拉开分散的区域。声波就是这两种区域不断重复的模式。

Because sound is a longitudinal wave, it cannot be polarised. This is an important difference from transverse waves such as light waves.

因为声波是纵波，所以它不能被偏振。这是它与光波等横波的一个重要区别。

3. Sound Needs a Medium | 声音需要介质

Sound cannot travel through a vacuum because there are no particles to carry the vibrations. This is why we cannot hear explosions in outer space, even though light from the explosion can reach us.

声音不能在真空中传播，因为真空中没有粒子来传递振动。这就是为什么我们在外太空听不到爆炸声，尽管爆炸产生的光可以到达我们。

Sound can travel through solids, liquids and gases. It generally travels fastest in solids, slower in liquids and slowest in gases because particle spacing affects how quickly energy is transferred.

声音可以在固体、液体和气体中传播。它通常在固体中传播最快，在液体中较慢，在气体中最慢，因为粒子间距会影响能量传递的速度。

The classic bell jar experiment shows that when air is pumped out of a glass jar, the ringing bell becomes quieter. Once the air is removed, the bell cannot be heard at all.

经典的钟罩实验表明，当空气从玻璃罩中抽出时，铃声会变轻。空气完全抽走后，就完全听不到铃声了。

4. Speed of Sound | 声音的速度

In air at room temperature, sound travels at roughly 330 to 340 metres per second (m/s). This is much slower than light, which travels at about 300,000,000 m/s.

在室温空气中，声音的传播速度大约为每秒 330 到 340 米。这比光速慢得多，光速约为每秒 3 亿米。

Because sound is slower than light, you see lightning before you hear thunder. The greater the distance, the longer the delay between the flash and the rumble.

因为声音比光慢，你会先看到闪电，后听到雷声。距离越远，闪光和雷声之间的间隔越长。

The speed of sound increases in warmer air and in denser materials. For example, sound travels about four times faster in water than in air, and even faster in steel.

声速在较暖的空气和较密的材料中会增加。例如，声音在水中的传播速度大约是空气中的四倍，在钢中传播更快。

5. Frequency and Wavelength | 频率与波长

Frequency is the number of complete vibrations per second. It is measured in hertz (Hz), where 1 Hz means one complete wave passes a point every second.

频率是每秒完整振动的次数。它的单位是赫兹（Hz），1 Hz 表示每秒有一个完整的波通过某一点。

Wavelength is the distance between two matching points on a wave, such as the distance from one compression to the next compression.

波长是波上两个对应点之间的距离，例如从一个压缩区到下一个压缩区之间的距离。

Wave speed, frequency and wavelength are linked by the equation shown below. If frequency increases while wave speed stays the same, the wavelength must decrease.

波速、频率和波长之间的关系如下方公式所示。如果波速不变，频率增加时波长必定减小。

v = f × λ

In this equation, v is wave speed in metres per second, f is frequency in hertz and λ is wavelength in metres.

在这个公式中，v 是以米每秒为单位的波速，f 是以赫兹为单位的频率，λ 是以米为单位的波长。

6. Pitch and Loudness | 音调与响度

Pitch is how high or low a sound seems to a listener. It depends on the frequency of the sound wave. A high-frequency sound has a high pitch, while a low-frequency sound has a low pitch.

音调是听者感觉到的声音高低。它取决于声波的频率。高频声音音调高，低频声音音调低。

Loudness describes how strong or weak a sound appears. It depends mainly on the amplitude of the wave, which is the maximum distance a particle moves from its rest position.

响度描述声音听起来有多强或多弱。它主要取决于波的振幅，振幅是粒子离开平衡位置的最大距离。

A larger amplitude transfers more energy, producing a louder sound. Loudness is often measured in decibels (dB). Sounds above about 85 dB can damage hearing with long exposure.

振幅越大，传递的能量越多，产生的声音越响。响度通常用分贝（dB）来测量。长时间暴露在约 85 分贝以上的声音中会损害听力。

7. The Human Ear | 人耳的结构

The ear converts sound waves into electrical signals that the brain interprets. Sound travels into the ear canal and makes the eardrum vibrate.

耳朵把声波转换成大脑可以理解的电信号。声音传入耳道，使鼓膜振动。

These vibrations are passed through small bones called ossicles to the cochlea. The cochlea converts the vibrations into nerve impulses that travel along the auditory nerve to the brain.

这些振动通过称为听小骨的小骨头传到耳蜗。耳蜗把振动转换成神经冲动，沿着听神经传到大脑。

Damage to the eardrum, ossicles or cochlea can cause hearing loss. Listening to very loud music with earphones is a common risk for young people, so headphones should be kept at safe volumes.

鼓膜、听小骨或耳蜗受损会导致听力下降。用耳机听非常响的音乐是年轻人常见的风险，因此耳机音量应保持在安全水平。

8. Ultrasound and Infrasound | 超声波与次声波

Humans can normally hear frequencies from about 20 Hz to 20,000 Hz (20 kHz). Sounds above this range are called ultrasound; sounds below it are called infrasound.

人类通常能听到大约 20 赫兹到 20,000 赫兹（20 千赫兹）的频率。高于这个范围的声音称为超声波，低于这个范围的声音称为次声波。

Ultrasound is used in medical scanning, industrial cleaning and sonar. It is useful because it can travel through soft tissue and reflect from boundaries inside the body.

超声波用于医学扫描、工业清洗和声呐。它很有用，因为它能穿过软组织，并在体内的边界处发生反射。

Some animals, such as bats and dolphins, use ultrasound for echolocation. Elephants may use infrasound to communicate over long distances.

有些动物，如蝙蝠和海豚，利用超声波进行回声定位。大象可能利用次声波进行远距离交流。

9. Echoes and Reflection | 回声与反射

When sound waves hit a hard, flat surface, they reflect. A reflected sound that arrives more than about 0.1 seconds after the original sound is heard as an echo.

当声波遇到坚硬、平坦的表面时会发生反射。反射声比原声晚约 0.1 秒以上到达时，我们就会听到回声。

Echoes are used by sonar systems to measure ocean depth. The time taken for the sound pulse to return is used with the speed of sound to calculate distance.

声呐系统利用回声测量海洋深度。声音脉冲返回所需的时间与声速一起用来计算距离。

Soft materials, such as foam and carpet, absorb sound waves and reduce echoes. This is why music studios often have padded walls and thick curtains.

泡沫和地毯等柔软材料会吸收声波并减少回声。这就是音乐工作室经常使用软垫墙壁和厚窗帘的原因。

10. Sound Wordsearch Challenge | 声音单词搜索挑战

Use the keywords below to build your own wordsearch grid or ask a partner to find them. First, read each definition carefully and match it to the correct term, then hide the words horizontally, vertically or diagonally in a 12 × 12 grid.

使用下面的关键词制作你自己的单词搜索网格，或请同伴找出这些词。首先，仔细阅读每个定义并将其与正确的术语匹配，然后在 12 × 12 的网格中水平、垂直或对角线隐藏这些单词。

Essential sound vocabulary for KS3 CIE:

KS3 CIE 声音核心词汇：

更多咨询请联系16621398022（同微信）