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Physics · May / June 2018 · Paper 11 · Question 38

5054Half-life

A radioactive isotope of hydrogen has a half-life of 12 years. A sample contains 40 million atoms of this isotope. How many atoms of this isotope are left after 24 years?

  1. A20 million
  2. B10 million
  3. C5 million
  4. Dzero

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Correct answer: B. 10 million

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