A-LevelPhysicsNuclear physics9702/12 · May/June 2021 · Q391 Mark

A nucleus of magnesium decays into a nucleus X by emitting a β⁺ particle. The decay is represented by the equation shown. ²³₁₂Mg → ᴾ_Q X + ⁰₁β⁺ What are the values of P and Q?

AP: 22, Q: 11

BP: 22, Q: 13

CP: 23, Q: 11

DP: 23, Q: 13

✓ Correct answer

C: P: 23, Q: 11

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Topic: Nuclear physics, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2021 Paper 1 Variant 2, question 39.

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