Physics
JAMB 2005
the time it will take a certain radioactive material with a half-life of 50 days to reduce to 1/32of its original number is
-
A.
250days
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B.
150days
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C.
300days
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D.
200days
Correct Answer: Option A
Explanation
Since 1/32, is the fraction left of any radioactive material after 5half lives, that is:
1/32= (1/2)5. Thus if a half life is 50 days, 5 half lives will be 50 x 5= 250 days
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