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JAMB Physics 2005 Question 9

Question 9

Radioactivity and Nuclear Physics

The time it will take a certain radioactive material with a half-life of 50 days to reduce to 1/32 of its original number is

  1. A.300 days.
  2. B.150 days.
  3. C.200 days.
  4. D.250 days.
Show the answer and explanation

Answer: D (250 days.)

Explanation

1/32 = (½)5, so 5 half-lives are needed: 5 × 50 = 250 days.