Edexcel A-Level Physics Topic 5.5: Stationary Waves | Edexcel A-Level 物理 5.5：驻波

📚 Edexcel A-Level Physics Topic 5.5: Stationary Waves | Edexcel A-Level 物理 5.5：驻波

Stationary waves are an essential part of the Edexcel A-Level Physics specification, appearing in both the AS and A2 units. They are also one of the most predictable topics for practical-style questions, especially those involving strings, air columns and resonance. This guide explains the key ideas, experiments, equations and exam traps you need to master for Topic 5.5.

驻波是 Edexcel A-Level 物理大纲中的重要内容，在 AS 和 A2 单元中都会出现。它也是实验类题目中最常考的主题之一，尤其是涉及弦、空气柱和共振的问题。本指南将带你梳理关键概念、实验、公式和考试中需要避开的常见陷阱。

1. What Are Stationary Waves? | 什么是驻波？

A stationary wave, also called a standing wave, is a wave pattern that is fixed in space rather than travelling through a medium. It is produced when two progressive waves of the same frequency, wavelength and amplitude travel in opposite directions and interfere. The resulting pattern appears to stand still, with clear positions of zero displacement and positions of maximum displacement. Unlike a progressive wave, a stationary wave does not transfer energy from one place to another.

驻波，也称为定波，是一种固定在空间中而不沿介质传播的波形。它由两列频率、波长和振幅相同但传播方向相反的行波叠加干涉而产生

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