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InterviewSolution
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A radioactive sample had an initial activily of 56 dpm (disintegration per min). After `69.3 min` it was found to have an activity of 28 dpm. Find the number of atoms in a sample having an activity of 10 dpm.A. 693B. 1000C. 100D. 10000 |
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Answer» Correct Answer - B Initial activity = 56 dpm after `69.3` min activity = 28 dpm `:. T_(1//2) =69.3 min " " lambda =(0.693)/(t_(1//2))=(0.693)/(69.3)=10^(-2min)` Activity `=lambda N` `10=10^(-2)xxN " " rArr " " N=1000` |
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