JAMB - Physics (2005 - No. 9)
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
250days
150days
300days
200days
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
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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