The half life of a radio active nuclide is 30 hr’s. What fraction of original activity will remain after 60 hr’s ?

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answer is A.

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Detailed Solution

60 hr’s means 2 half-lifes thus A=A02n= A022=A04 [ n=No. of half lives] ⇒AA0=14 So one fourth of the original activity will remain after 60 hr’s.

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