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5.2.4a Half-life

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Question 56

A sample of a radioactive isotope emits 8000 β\betaβ-particles per second.

After 75 hours the rate of emission has fallen to 250 β\betaβ-particles per second.

What is the half-life of this isotope?

A

5.0 hours5.0\text{ hours}5.0 hours

B

15 hours15\text{ hours}15 hours

C

25 hours25\text{ hours}25 hours

D

37.5 hours37.5\text{ hours}37.5 hours

Markscheme

5.2.4a Half-life Questions

  1. IGCSE
  2. /Physics
  3. /5.2.4a Half-life

144 exam-style questions on CIE IGCSE Physics 5.2.4a Half-life. Each one has a worked solution and a mark scheme showing where the marks go.

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