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Physics (AS & A Level) · May / June 2019 · Paper 12 · Question 39

9702Fundamental particles

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

  1. Adown → up + positron + electron neutrino
  2. Bdown → up + positron + electron antineutrino
  3. Cup → down + positron + electron neutrino
  4. Dup → down + positron + electron antineutrino

As printed in the paper

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Correct answer: C. up → down + positron + electron neutrino

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