AQA AS Physics Unit 5 January 2019 Paper Review | AQA AS 物理 Unit 5 2019年1月真题回顾

📚 AQA AS Physics Unit 5 January 2019 Paper Review | AQA AS 物理 Unit 5 2019年1月真题回顾

The January 2019 AQA AS Physics paper (often labelled Unit 5) tested the core areas of the AS specification: measurements and errors, particles and radiation, waves, mechanics and materials, and electricity. This article unpacks the key concepts behind the most common question types, with worked examples that mirror the style of the exam. Use this guide to strengthen weak areas and approach similar questions with confidence.

2019年1月AQA AS物理试卷（常称Unit 5）考查了AS大纲中的核心板块：测量与误差、粒子与辐射、波动、力学与材料、以及电学。本文将剖析最常考题型背后的关键概念，并提供贴近真题风格的例题精解。请用本指南巩固薄弱环节，从容应对类似题目。

1. Measurements and Errors | 测量与误差

Measurement questions in the January paper tested three essential skills: reading instruments to the correct precision, quoting answers with appropriate units, and combining uncertainties using the rules for addition/subtraction and multiplication/division.

1月试卷中的测量题考查三项核心技能：按正确精度读取仪器读数、为答案标注恰当单位、以及利用加减法和乘除法规则合成不确定度。

When adding or subtracting measurements, add the absolute uncertainties. When multiplying or dividing, add the percentage uncertainties.

测量值相加减时，绝对不确定度直接相加；相乘除时，百分比不确定度相加。

Worked example: a voltmeter reads 6.0 V ± 0.1 V and an ammeter reads 2.00 A ± 0.01 A. They are used to determine a resistance.

例题：电压表读数为6.0 V ± 0.1 V，电流表读数为2.00 A ± 0.01 A，用它们来测定电阻。

R = V ÷ I = 6.0 ÷ 2.00 = 3.0 Ω

Published by TutorHao | AS Physics Revision Series | aleveler.com

更多咨询请联系16621398022（同微信）