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Physics · Oct / Nov 2022 · Paper 11 · Question 39

5054Half-life

What is meant by the half-life of a radioactive substance?

  1. Ahalf the time for all the unstable nuclei to decay
  2. Bhalf the time it takes an unstable nucleus to emit radiation
  3. Cthe time for half the unstable nuclei to decay
  4. Dthe time for the nucleon number to halve

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Correct answer: C. the time for half the unstable nuclei to decay

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