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The half - line period a radioactive element `X` is same as the mean life time of another radioactive element `Y`. Initially both of them have the same number of atoms. Then:A. X and Y have the same decay rate initiallyB. X andY decay at the same rate alwaysC. Y will decay at a faster rate than XD. X will decay at a faster rate than Y |
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Answer» Correct Answer - c Half life of x = mean life of y Let `lambda_(x) andlambda_(y)` be decay constants of x and y then conditon (1) implies `(0.696)/(lamdba_(x))=(1)/(lambda_(y))rArr(lambda_(x))/(6.693)rArrlambda_(y)gtlambda_(x)` As rate of decay `alphalamdba`, hence decay of y will be faster than that of x. |
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