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Physics (AS & A Level) · Oct / Nov 2021 · Paper 12 · Question 39

9702Atoms, nuclei and radiation

An unstable nucleus decays by emitting a β+ particle. Which statement is correct?

  1. AAn antineutrino is also emitted.
  2. BA neutron changes into a proton.
  3. CMass–energy is conserved.
  4. DThe nucleon number is not conserved.

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Correct answer: C. Mass–energy is conserved.

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