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InterviewSolution
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Caculalate the mass of `.^(140)LA` in a sample whose activity is `3.7xx10^(10)Bq` (`1` Becquerel, `Bq= 1` disntegration per second) given that is `t_(1//2)` is 40 hour. |
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Answer» Rate of decay `= lambda` `N_(0) = (lambda xx w xx Av. No .)/(140)` [Let `w` is weight of `La^(140)`, then `N_(0) = (w xx Av. No .)/(140)`] `3.7xx10^(10) = (0.693)/(40xx60xx60) xx (w xx 6.02xx10^(23))/(140)` `w = 1.79xx10^(-6) g` |
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