AQA A-Level Physics Unit 5 June 2022 Mark Scheme Analysis | AQA 物理 A-level 第五单元 2022年6月评分标准解析

📚 AQA A-Level Physics Unit 5 June 2022 Mark Scheme Analysis | AQA 物理 A-level 第五单元 2022年6月评分标准解析

This article provides a detailed review of the marking principles behind the AQA A-Level Physics Unit 5 (Nuclear and Thermal Physics) June 2022 mark scheme. It is designed to help candidates understand not only what the correct answers were, but also why each mark was awarded, how command words control the expected response, and where students most commonly lost marks.

本文围绕 AQA 物理 A-level 第五单元（核物理与热物理）2022 年 6 月考试的评分标准（mark scheme）展开深度解析，帮助考生理解每个得分点背后的逻辑，掌握指令动词与答题句式之间的关系，并总结考生最常见的失分原因。

1. Paper Structure and Assessment Objectives | 试卷结构与考核目标

Unit 5 is divided into two sections. Section A covers nuclear and thermal physics and carries approximately two-thirds of the total marks. Section B covers the chosen option topic. In the June 2022 series, the paper was marked out of 80 with a duration of 1 hour 45 minutes. Marks are allocated across the three AQA assessment objectives, and the mark scheme is structured to show exactly which objective each question is testing.

第五单元试卷分为两部分：A 部分考查核物理与热物理，约占总分的三分之二；B 部分考查考生自选的选修专题。2022 年 6 月卷面满分为 80 分，考试时长 1 小时 45 分钟。题目按 AQA 三大评估目标分配分值，评分标准会逐题标出所考查的目标，便于教师阅卷时统一尺度。

The mark scheme uses three code words for examiners: ‘allow’ (an acceptable alternative answer), ‘ignore’ (irrelevant information that does not affect the mark), and ‘do not allow’ (a specific wrong statement that must not be credited). Understanding these three terms is essential when you self-mark your practice papers.

评分标准为阅卷者设定了三个专用术语：”allow”（可接受的其他表述）、”ignore”（无关信息，不影响得分）与”do not allow”（明确的错误表述，不得给分）。自己批改练习卷时，理解这三者的区别至关重要。

2. Thermal Physics — Internal Energy and Heat Transfers | 热物理——内能与热传递

In the June 2022 mark scheme, the definition of internal energy was credited as ‘the sum of the randomly distributed kinetic and potential energies of the particles in a body’. Candidates who wrote ‘the heat inside an object’ received no mark, because the phrasing fails to identify the microscopic origin of the energy.

2022 年 6 月评分标准中，内能的定义得分点为”物体内部分子随机分布的动能与势能的总和”。若考生写成”物体内部的热量”则不得分，因为该表述没有揭示能量的微观来源。

The first law of thermodynamics appeared in the form ΔU = Q + W. The mark scheme uses the convention that Q is the heat supplied to the system and W is the work done on the system. A full-mark answer was: ‘The increase in internal energy of a system equals the thermal energy supplied to the system plus the work done on the system.’

热力学第一定律以 ΔU = Q + W 的形式考查。评分标准采用如下符号约定：Q 为系统从外界吸收的热量，W 为外界对系统所做的功。满分答案为：”系统内能的增量等于系统吸收的热量加上外界对系统所做的功。”

Specific heat capacity calculations were marked in three stages: correct formula (Q = mcΔθ), correct substitution with temperature converted into kelvin where required, and a final answer with an appropriate unit. The mark scheme also credited the use of Δθ in Celsius because a temperature difference is identical in either scale.

比热容计算题按三步给分：写出正确公式 Q = mcΔθ；代入数据时注意温度是否需换算为开尔文；最终答案带正确单位。评分标准特别说明，温度差 Δθ 用摄氏度与开尔文均可，因为两种温标的温差数值完全相同。

3. Ideal Gases and Kinetic Theory | 理想气体与分子动理论

For the ideal gas equation, a ‘state’ question awarded 1 mark for pV = nRT. A ‘calculate’ question, however, required correct substitution and unit conversion, especially converting cm³ to m³ and °C to K. In the June 2022 series, a significant number of candidates lost the

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