# 2022-2024新考纲A-Level物理AS知识点介绍！

CAIE考试局官网发布了新的考试大纲，适用于2022—2024年的考试，今天就为各位同学解读一下2022-2024新考纲A-Level物理AS部分的一些改动~

Density and pressure

calculate the upthrust acting on an object in a fluid using the equation F = ρgV (Archimedes’ principle)

Stress and strain

understand and use the terms load, extension, compression and limit of proportionality

Electromagnetic spectrum

recall that wavelengths in the range 400–700 nm in free space are visible to the human eye.

Polarisation

1.understand that polarisation is a phenomenon associated with transverse waves

2. recall and use Malus’s law (I = I0 cos2θ ) to calculate the intensity of a plane polarised electromagnetic wave after transmission through a polarising filter or a series of polarising filters

Resistance and resistivity

explain that the resistance of a filament lamp increases as current increases because its temperature increases

understand that the resistance of a thermistor decreases as the temperature increases (it will be assumed that thermistors have a negative temperature coefficient)

understand that the resistance of a light-dependent resistor (LDR) decreases as the light intensity increases

Potential dividers

understand the use of a galvanometer in null methods

explain the use of thermistors and light-dependent resistors in potential dividers to provide a potential difference that is dependent on temperature and light intensity

understand that α-particles have discrete energies but that β-particles have a continuous range of energies because (anti)neutrinos are emitted in β-decay

represent α- and β-decay by a radioactive decay equation of the form use the unified atomic mass unit (u) as a unit of mass

Fundamental particles

recall and use the charge of each flavour of quark and understand that its respective antiquark has the opposite charge (no knowledge of any other properties of quarks is required)

understand that a hadron may be either a baryon (consisting of three quarks) or a meson (consisting of one quark and one antiquark)

Electric fields

Concept of an electric field

a) understand the concept of an electric field as an example of a field of force and define electric field strength as force per unit positive charge acting on a stationary point charge

b) represent an electric field by means of field lines

Uniform electric fields

a) recall and use E=ΔV/Δd to calculate the field strength of the uniform field between charged parallel plates in terms of potential difference and separation

b) calculate the forces on charges in uniform electric fields

c) describe the effect of a uniform electric field on the motion of charged particles

AS物理之前有对Electric field的要求，由于A2还会继续深入讲解关于电场的内容，可能是由此考虑，2022新大纲将电场部分的内容移动到A2部分学习。

【免费领取】备考资料，了解最新课程安排以及预约试听体验课