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Physics · May / June 2016 · Paper 12 · Question 39

5054Half-life

Which statement about the half-life of a radioactive isotope is correct?

  1. AHalf-life changes as the isotope decays.
  2. BHalf-life is the time it takes for the nucleon number of the isotope to halve.
  3. CHalf-life is half the time it takes for the number of nuclei of the isotope to decrease to zero.
  4. DHalf-life is the time it takes for the number of nuclei of the isotope to decrease by half.

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Correct answer: D. Half-life is the time it takes for the number of nuclei of the isotope to decrease by half.

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