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Physics (AS & A Level) · May / June 2019 · Paper 13 · Question 40

9702Fundamental particles

Which statement describes β⁻ decay in terms of a simple quark model?

  1. AA down quark changes to an up quark, and an electron and an electron antineutrino are emitted.
  2. BA down quark changes to an up quark, and a positron and an electron neutrino are emitted.
  3. CAn up quark changes to a down quark, and an electron and an electron antineutrino are emitted.
  4. DAn up quark changes to a down quark, and a positron and an electron neutrino are emitted.

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Correct answer: A. A down quark changes to an up quark, and an electron and an electron antineutrino are emitted.

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