Physics 0625 · IGCSE · Radioactivity

Radioactivity — practice question

A sample of a radioactive isotope emits 9600 $\alpha$-particles per second. After 40 hours, the emission rate has dropped to 600 $\alpha$-particles per second. What is the half-life of this isotope?

  • A4.0 hours
  • B8.0 hours
  • C10 hours
  • D20 hours

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