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Physics (AS & A Level) · Oct / Nov 2019 · Paper 12 · Question 40

9702Fundamental particles

An unstable nucleus decays and emits a β– particle. Which changes, if any, occur to the quark composition of the nucleus?

  1. A+1 up quarks, 0 down quarks
  2. B+1 up quarks, –1 down quarks
  3. C–1 up quarks, +1 down quarks
  4. D0 up quarks, +1 down quarks

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Correct answer: B. +1 up quarks, –1 down quarks

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