passwella.
Menu

JAMB Physics 2003 Question 40

Question 40

Radioactivity and Nuclear Physics

The count rate of a radioactive material is 800 count/min. If the half-life of the material is 4 days, what would the count rate be 16 days later?

  1. A.200 count/min.
  2. B.100 count/min.
  3. C.50 count/min.
  4. D.25 count/min.
Show the answer and explanation

Answer: C (50 count/min.)

Explanation

16 days is 4 half-lives: 800 → 400 → 200 → 100 → 50 count/min.