The half life of a certain radioactive isotope is 28 hr’s . What fraction of sample would remain after 7 h ?

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0.68

0.65

0.71

0.84

answer is D.

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Detailed Solution

Decay Law , N = No12n where n = no of half lives = tTh=728=14=0.25 ∴Remaining fraction = N No=120.25 =0.84

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