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Physics · May / June 2016 · Paper 11 · Question 39

5054Half-life

A sample of a radioactive isotope produces a count rate of 10 000 counts per minute. The half-life of the isotope is one day. What was the count rate of the sample two days ago?

  1. A2500 counts per minute
  2. B5000 counts per minute
  3. C20 000 counts per minute
  4. D40 000 counts per minute

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Correct answer: D. 40 000 counts per minute

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