The count rate of an alpha-particle source is 400 per minute. If the half-life of
PHYSICS
WAEC 1996
The count rate of an alpha-particle source is 400 per minute. If the half-life of the source is 5 days, what would be the count rate per minute after 15 days?
- A. 20
- B. 25
- C. 50
- D. 200
Correct Answer: C. 50
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