2025 AQA A-LEVEL PHYSICS Paper 3 Section B Turning Points in Physics Question Paper & Mark Scheme (Merged) Tuesday 17 June 2025 [VERIFIED]

2025 AQA A-LEVEL PHYSICS Paper 3 Section B Turning Points in Physics Question Paper &
Mark Scheme (Merged) Tuesday 17 June 2025 [VERIFIED]

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Section B
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Answer all questions in this section.


0 1 This question is about Thomson’s determination of the electron’s specific charge.

You should not use the values of the electron charge, mass or specific charge from the
data and formulae booklet in this question.

Figure 1 shows part of the apparatus that Thomson used to measure the specific charge
of the electron.

Figure 1




0 1 . 1 A modern version of Thomson’s apparatus uses thermionic emission in the production
of the electron beam.

Suggest how the electron beam is produced in this modern version.
You should include a labelled diagram and suitable values for the power supplies
used.

[3 marks]




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