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Physics (AS & A Level) · May / June 2020 · Paper 13 · Question 40

9702Fundamental particles

Which equation describes the process of β+ decay? key: u = up quark d = down quark ν = (electron) neutrino ν̄ = (electron) antineutrino

  1. Addu → uud + β+ + ν
  2. Bddu → uud + β+ + ν̄
  3. Cuud → ddu + β+ + ν
  4. Duud → ddu + β+ + ν̄

As printed in the paper

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Correct answer: C. uud → ddu + β+ + ν

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