📚 AS AQA Physics Unit 2 January 2022 Paper Walkthrough | AS AQA 物理 Unit 2 2022年1月试卷解析
The January 2022 AQA AS Physics Unit 2 paper tested candidates on two broad areas: waves and electricity. This walkthrough breaks down the core concepts, typical question styles, and the precise markscheme language needed to secure full marks.
2022年1月AQA AS物理Unit 2试卷主要考查两大板块：波动与电学。本文逐节拆解核心概念、典型题型以及在评分标准中锁定满分的准确表述。
1. Paper Overview | 试卷概览
Unit 2 is divided into two sections. Section A contains objective and short-answer questions worth roughly 40 marks. Section B contains a longer structured question worth about 30 marks. In the January 2022 series, the balance between waves and electricity was roughly equal, with waves slightly more heavily weighted.
Unit 2分为两部分。A部分包含客观题和简答题，约40分。B部分包含一道较长的结构化综合题，约30分。在2022年1月的考试中，波动与电学分值大致相当，波动略重。
rge e = 1.60 × 10⁻¹⁹ C. These are printed on the paper, but internalising them saves time.
需要牢记的常数：真空光速 c = 3.00 × 10⁸ m s⁻¹，电子电荷 e = 1.60 × 10⁻¹⁹ C。试卷上虽会给出，但熟记能节省时间。
2. Progressive Waves and the Wave Equation | 前进波与波动方程
A progressive wave transfers energy from one place to another without transferring matter. For a transverse wave the oscillations are perpendicular to the direction of energy transfer; for a longitudinal wave they are parallel.
前进波将能量从一处传递到另一处，而不传递物质。横波的振动方向垂直于能量传播方向；纵波的振动方向与传播方向平行。
The wave equation connects wave speed v, frequency f and wavelength λ:
波动方程将波速 v、频率 f 和波长 λ 联系起来：
v = f × λ
velling at 340 m s⁻¹. Using λ = v / f = 340 / 440 = 0.773 m. Be careful with unit prefixes — the answer must be given to an appropriate number of significant figures, usually 3.
2022年1月试题要求计算频率440 Hz、
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