Physics 0625 · IGCSE · Radioactivity

Radioactivity — practice question

A specimen of a radioactive isotope begins with an emission rate of 128 counts per minute and has a half-life of 4 days. How much time will pass before the emission rate decreases to 32 counts per minute?

  • A2 days
  • B4 days
  • C8 days
  • D12 days

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