A-LevelPhysicsNuclear physics9702/12 · Feb/Mar 2017 · Q391 Mark

A nucleus of sodium-21, ²¹₁₁Na, decays to form a new nucleus containing 10 protons and 11 neutrons. Which leptons are emitted from the sodium-21 nucleus during the decay?

Apositron and an antineutrino

Bpositron and a neutrino

Can electron and an antineutrino

Dan electron and a neutrino

✓ Correct answer

B: positron and a neutrino

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Topic: Nuclear physics, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Feb/Mar 2017 Paper 1 Variant 2, question 39.

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