AS Physics Unit 2 Insert Jan19 Concept Breakdown | AS物理 Unit 2 插入材料概念解析

📚 AS Physics Unit 2 Insert Jan19 Concept Breakdown | AS物理 Unit 2 插入材料概念解析

The AQA AS Physics Unit 2 (Mechanics, Materials and Waves) January 2019 insert is more than just a data sheet; it is a condensed toolkit of equations, constants, and reference diagrams. Understanding the physical principles behind each formula is essential for accurate problem-solving and conceptual analysis. This revision guide unpacks every key concept from the insert, pairing clear definitions with worked examples to build your confidence.

AQA AS物理第二单元（力学、材料与波）2019年1月的插入材料不仅仅是一份数据表；它是浓缩的公式、常数与参考图示工具箱。理解每条公式背后的物理原理对于准确解题和概念分析至关重要。本复习指南将拆解插入材料中的每一个关键概念，搭配清晰的定义与示例，助你树立信心。

1. Wave Equation v = fλ | 波动方程 v = fλ

The insert highlights the universal wave equation v = f λ, where v is wave speed, f is frequency and λ is wavelength. This relationship holds for all wave types, including sound, light, and water waves. When a wave passes from one medium to another, its speed and wavelength change, but its frequency remains constant because it is determined by the source.

插入材料中强调普适的波动方程 v = f λ，其中 v 为波速，f 为频率，λ 为波长。该关系对所有波类型都成立，包括声波、光波和水波。当波从一种介质进入另一种介质时，波速和波长会改变，但频率保持不变，因为它由波源决定。

In calculations, rearrange the equation to find the unknown quantity. For instance, visible light has frequencies around 10¹⁴–10¹⁵ Hz. If green light of frequency 5.6 × 10¹⁴ Hz travels in vacuum (v = 3.00 × 10⁸ m s⁻¹)， its wavelength is λ =

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