A-LevelPhysicsParticle physics9702/12 · Oct/Nov 2019 · Q401 Mark

An unstable nucleus decays and emits a β⁻ particle. Which changes, if any, occur to the quark composition of the nucleus?

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Aup quarks: +1, down quarks: 0

Bup quarks: +1, down quarks: -1

Cup quarks: -1, down quarks: +1

Dup quarks: 0, down quarks: +1

✓ Correct answer

B: up quarks: +1, down quarks: -1

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Topic: Particle physics, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2019 Paper 1 Variant 2, question 40.

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