Physics WAEC

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?
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?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
E. 400

Correct Answer:

Option C – 50

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5 years ago

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