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Half life of a radioactive element is 10days.

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Half life of a  radioactive  element is10 days. The time during which remains 1/10 of initial mass  will be

A)100days

B) 50days

C) 33days

D) 16days
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1 Answer

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 After three half-lives (i.e., 30 days) it remains (1/2)3=1/8 ,so it will remain 1/10th approximately in 33 days.

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