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Physics (AS & A Level) · Feb / March 2017 · Paper 12 · Question 39

9702Atoms, nuclei and radiation

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

  1. Aa positron and an antineutrino
  2. Ba positron and a neutrino
  3. Can electron and an antineutrino
  4. Dan electron and a neutrino

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Correct answer: B. a positron and a neutrino

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