ACTUAL 2025 AQA A-LEVEL PHYSICS Paper 1 Question Paper & Mark Scheme (Merged) Friday 23 May 2025 [VERIFIED]

ACTUAL 2025 AQA A-LEVEL PHYSICS Paper 1 Question Paper & Mark Scheme (Merged) Friday 23 May 2025
[VERIFIED]

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Section A box

Answer all questions in this section.


0 1 This question is about an isotope of titanium that only decays by electron capture.

0 1 . 1 Complete Figure 1 to show the quark change that occurs during electron capture. Label
the incoming and outgoing particles and the exchange particle.
[3 marks]

Figure 1




0 1 . 2 In some circumstances, a nucleus of this isotope can exist with no orbiting electrons.

Explain why a neutral atom of this isotope is less stable than a nucleus that has no
orbiting electrons.
[1 mark]




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0 1 . 3 A nucleus of this isotope of titanium has a proton number of 22 and a specific charge of box
4.8 × 107 C kg−1.

Determine the number of neutrons in this nucleus.
[2 marks]




number of neutrons = 6




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