Physics 5054 · O Level · Half-life

Half-life — practice question

One radioactive isotope of hydrogen has a half-life of $12\text{ years}$. A sample contains $40$ million atoms of this isotope. How many atoms of this isotope remain after $24\text{ years}$?

  • A$20$ million
  • B$10$ million
  • C$5$ million
  • Dzero

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