GCSE Physics: Waves Revision Guide | GCSE 物理：波 考点精讲

📚 GCSE Physics: Waves Revision Guide | GCSE 物理：波 考点精讲

This comprehensive guide summarises the key concepts of waves required for GCSE Physics. You will learn about wave types, properties, the wave equation, behaviours like reflection, refraction and diffraction, sound waves, the electromagnetic spectrum, and their real-world applications. Use this resource to support your revision and build confidence for your exams.

这本综合指南总结了 GCSE 物理中波的关键概念。你将学习波的类型、性质、波动方程、反射、折射和衍射等行为、声波、电磁波谱及其实际应用。使用本资料辅助复习，增强考试信心。

1. Types of Waves | 波的种类

Waves are disturbances that transfer energy from one place to another without transferring matter. There are two main types: transverse and longitudinal waves.

波是扰动，可将能量从一个地方传递到另一个地方而不传递物质。主要有两种类型：横波和纵波。

In a transverse wave, the oscillations are perpendicular to the direction of energy transfer. Examples include light, water ripples, and all electromagnetic waves.

在横波中，振动方向与能量传递方向垂直。例如光、水波涟漪和所有电磁波。

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

在纵波中，振动方向与能量传递方向平行，由压缩和稀疏组成。声波和地震P波是纵波。

You must be able to identify a transverse wave by the peaks (crests) and troughs, and a longitudinal wave by areas where particles are bunched together (compressions) and spread apart (rarefactions).

你必须能够通过波峰和波谷辨认横波，通过粒子聚集（压缩）和分散（稀疏）的区域辨认纵波。

2. Describing Wave Properties | 描述波的性质

The amplitude of a wave is the maximum displacement of a point on the wave from its rest position. It is related to the energy carried by the wave – greater amplitude means more energy.

振幅是波上某点偏离平衡位置的最大位移。它与波携带的能量有关——振幅越大，能量越大。

Wavelength (λ) is the distance between two corresponding points on consecutive waves, for example from crest to crest or compression to compression. It is measured in metres (m).

波长（λ）是连续波上两个对应点之间的距离，例如从波峰到波峰或从压缩到压缩。单位为米（m）。

Frequency (f) is the number of complete waves passing a point per second, measured in hertz (Hz). One hertz is one wave per second. Period (T) is the time for one complete wave to pass a point, and is the reciprocal of frequency: T = 1/f.

频率（f）是每秒通过某点的完整波的个数，单位是赫兹（Hz）。1 Hz 表示每秒一个波。周期（T）是一个完整波通过某点所需的时间，与频率互为倒数：T = 1/f。

Wave speed (v) is how fast the wave travels, dependent on the medium. It is commonly measured in metres per second (m/s).

波速（v）是波传播的速度，取决于介质。通常单位为米每秒（m/s）。

You should be able to label these quantities on a diagram of a transverse wave or a longitudinal wave representation.

你应该能够在横波图或纵波示意图上标出这些量。

3. The Wave Equation | 波动方程

The relationship between wave speed, frequency, and wavelength is given by the wave equation:

波速、频率和波长之间的关系由波动方程给出：

v = f × λ

where v = wave speed (m/s), f = frequency (Hz), λ = wavelength (m).

其中 v = 波速（m/s），f = 频率（Hz），λ = 波长（m）。

This equation can be rearranged to find any unknown quantity: f = v / λ and λ = v / f. Always ensure units are consistent before substituting into the formula.

该方程可以变形以求解任何未知量：f =

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