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A radioactive sample had an initial acti...

A radioactive sample had an initial activity of 56 dpm . After 69.3 minutes , it was found to have an activity of 28 dpm , the number of atoms in a sample having an activity of 100 dpm is `10^(x)` . The value of x is …….

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56 dpm `overset(t_(1//2) = 69.3 "min") (to) 28 dpm A = lambda N , 100 = ((0.693)/(69.3)) , N_(t) , N_(t) = 10^(4)`
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