Alevel物理知识点新增部门来了 2022-2024考试改动范围有点大

大家都知道了Alevel考试的大纲都出现了一些新变化，本期我们以Alevel物理这门学科为例，来给大家讲讲Alevel物理知识点新增部分吧！

Alevel物理知识点新增部分

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，新大纲明确要求掌握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

Atoms, nuclei and radiation

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

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