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Physics (AS & A Level) · May / June 2025 · Paper 12 · Question 40

9702Fundamental particles

A nucleus of carbon-11 contains 6 protons and 5 neutrons. The nucleus of carbon-11 decays by β+ emission. What is the total number of up and down quarks in the product of the decay of this nucleus?

  1. Aup quarks 15, down quarks 18
  2. Bup quarks 16, down quarks 17
  3. Cup quarks 17, down quarks 16
  4. Dup quarks 18, down quarks 15

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Correct answer: B. up quarks 16, down quarks 17

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