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JAMB Physics 2000 Question 37

Question 37

Radioactivity and Nuclear Physics

If the fraction of the atoms of a radioactive material left after 120 years is 1/64, what is the half-life of the material?

  1. A.2 years
  2. B.10 years
  3. C.20 years
  4. D.24 years
Show the answer and explanation

Answer: C (20 years)

Explanation

1/64 = (½)6, so 6 half-lives took 120 years. Half-life = 120/6 = 20 years.