ACTUAL 2025 AQA A-LEVEL PHYSICS Paper 2 Question Paper & Mark Scheme (Merged) Monday 9 June 2025 [VERIFIED]

ACTUAL 2025 AQA A-LEVEL PHYSICS Paper 2
Question Paper & Mark Scheme (Merged) Monday 9 June 2025 [VERIFIED]

, 2
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outside the

Section A box

Answer all questions in this section.


0 1 Information about the radius of a nucleus can be deduced from the closest approach of
alpha particles and from electron diffraction.

1
0 1 . Alpha particles, each with a kinetic energy of 5.59 MeV, are fired at a thin foil made of
gold 197
79 Au atoms.
Some of the alpha particles are scattered through an angle of 180°.


Estimate the radius of a 19779Au nucleus from this information.

[3 marks]




radius of nucleus = m



0 1 . 2 Explain why your answer to Question 01.1 is an estimate.
[2 marks]




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,3
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, 4
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0 1 . 3 Electron diffraction gives a more precise value for the radius of the nucleus. box

Sketch, on Figure 1, a graph of intensity against angle for electron diffraction by a
nucleus.
Go on to state the feature of this graph that is used to determine the radius of the
nucleus.
[2 marks]

Figure 1




Question 1 continues on the next page


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