A-LevelPhysicsNuclear physics9702/12 · Feb/Mar 2025 · Q381 Mark

A stationary nucleus has nucleon number A. The nucleus decays by emitting a proton with speed v to form a new nucleus with speed u. The new nucleus and the proton move away from one another in opposite directions. Which equation gives v in terms of A and u?

Av = ((A-1)/4)u

Bv = (A - 1)u

Cv = Au

Dv = (A + 1)u

✓ Correct answer

B: v = (A - 1)u

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Topic: Nuclear physics, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Feb/Mar 2025 Paper 1 Variant 2, question 38.

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