A-LevelPhysicsParticle physics9702/12 · May/June 2019 · Q391 Mark

Which equation describes the changes to the quark composition of a nucleus and the lepton emission during the process of β⁺ decay?

Adown → up + positron + electron neutrino

Bdown → up + positron + electron antineutrino

Cup → down + positron + electron neutrino

Dup → down + positron + electron antineutrino

✓ Correct answer

C: up → down + positron + electron neutrino

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Topic: Particle physics, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2019 Paper 1 Variant 2, question 39.

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