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Physics · May / June 2021 · Paper 11 · Question 39

5054Half-life

The count rate from a radioactive source falls from 4000 counts per minute to 500 counts per minute in 72 minutes. What is the half-life of the source?

  1. A8 minutes
  2. B9 minutes
  3. C18 minutes
  4. D24 minutes

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Correct answer: D. 24 minutes

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