AQA A-Level Physics Paper 3 (3BD), June 2025

Every question from AQA A-Level Physics Paper 3 (3BD), June 2025 (7408): 4 questions, 35 marks, each with its mark scheme and topic.

Original question paper

1. Question 1 16 marks

   Explain the production of an electron beam by thermionic emission, determine the specific charge of an electron, discuss its significance, and evaluate experimental methods to minimise uncertainty.

   Optional topics · Practical skills · 3.12 Turning points in physics (A-level only) · Uncertainty and evaluation

2. Question 2 4 marks

   Compare experimental black-body radiation results with classical theoretical predictions of the ultraviolet catastrophe, and outline Planck's proposal that resolved the contradiction.

   Optional topics · 3.12 Turning points in physics (A-level only)

3. Question 3 6 marks

   Discuss how the work of Fizeau, Foucault, Hertz and Maxwell contributed to our understanding of the nature of light, referencing pre-1800 models, Maxwell's theory, and the significance of their measurements.

   Optional topics · 3.12 Turning points in physics (A-level only)

4. Question 4 9 marks

   Use special relativity concepts, including time dilation, length contraction, and the invariance of the speed of light, to determine journey times, cargo fit, and signal speed.

   Optional topics · 3.12 Turning points in physics (A-level only)

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