Physics 7408/3A June 2021

The AQA A-level Physics Paper 3A (November 2021) assesses experimental and analytical skills with applications in gamma radiation, LED wavelength analysis, and capacitor discharge. Key topics include verification of the inverse-square law for gamma radiation, calculation of Planck′s constant using LED data, and determination of voltmeter resistance through capacitor discharge analysis. Questions involve graphical data interpretation, uncertainty analysis, and use of advanced circuits for experimental physics. Emphasis is placed on precision, data validation, and the relationship between theoretical models and empirical findings. Keywords: AQA Physics, gamma radiation, inverse-square law, LED spectrum, Planck constant, capacitor discharge, voltmeter resistance.