ALevel物理课程考点内容梳理：波的干涉（wave interference）

Alevel物理在修改大纲后各个单元都有增加一些知识点，同时也提高了对某些知识点的掌握要求，总的来看，难度和广度都有所增加，今天为大家梳理ALevel物理课程考点内容：波的干涉（wave interference）。

ALevel物理波(Waves)一直是学习的难点，考察的重点，先掌握下面的关键词：

Transverse wave

Longitudinal wave

Oscillation(SHM)

Vibration

Peak/Crest

Trough

Compression

•Rarefaction

•Phase

Path difference

Path length

Phase difference

Superposition Interference

Constructive

Destructive

Edexcel考试局考试大纲中对Wave interference的要求主要围绕下面两个知识点：

39. know and understand what is meant by wavefront, coherence, path difference, superposition, interference and phase

知道并理解wavefront，coherent，path difference，superposition，interference和phase这几个概念。

40. be able to use the relationship between phase difference and path difference

能够应用phase difference和path difference之间的关系解题。

CAIE剑桥考试局对这部分的要求有四点，不过第三和第四点我们归类到双缝衍射。

1. understand the terms interference and coherence  理解什么是interference和coherence

2. show an understanding of experiments that demonstrate two-source interference using water waves in a ripple tank, sound, light and microwaves  理解波的干涉实验

3. understand the conditions required if two-source interference fringes are to be observed 4 recall and use λ = ax /D for double-slit interference using light

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