Two radioactive `X_(1)` and `X_(2)` have decay constants `10 lambda ` and `lambda` respectively . If initially they have the same number of nuclei, then the ratio of the number of nuclei of `X_(1)` to that of `X_(2)`will be `1//e` after a time .

Two radioactive materials X_(1) and X_(2) have decay constants 5 lambda and lambda respectively. If initially they have the same number of nuclei, then the ratio of the number of muclei of X_(1) to that of X_(2) will be 1/e after a time

Two radioactive materials X_(1) and X_(2) have decayconstants 10lambda and lambda respectively. If initially they have the same number of nuclei, then the ratio of the number of nuclei of X_(1) , to that of X_(2) will be 1/e after a time,

Two radiouctive materials X_(1) and X_(2) have decayconstants 10lambda and lambda respectively. If initially they have the same number of nuclei, then the ratio of the number of nuclei of X_(1) , to that of X_(2) will be 1/e after a time,

Two radioactive materials X_(1) and X_(2) have decay constants 5 lambda and lambda respectively. If initially they have the same number of nuclei, then the ratio of the number of nuclei of X_(1) to that of X_(2) will be 1/e after a time (1.) λ (2.) 1/ 2 λ (3.) 1/ 4 λ (4.) e/ λ

Two radioactive X_(1) and X_(2) have docay constants 10 lambda and lambda respecttively . If inittially they have the same number of noclei, then the radio of the number of nuclei of X_(1) to that of X_(2) will be 1//e after a time .

Two radioactive materials X_(1) and X_(2) have decay constants 10 lamda and lamda respectively. If initially they have the same number of nuclei, if the ratio of the number of nuclei of X_(1) to that of X_(2) will be 1//e after a time n/(9lamda) . Find the value of n ?

Two radioactive materials X_(1) and X_(2) have decay constants 10 lamda and lamda respectively. If initially they have the same number of nuclei, if the ratio of the number of nuclei of X_(1) to that of X_(2) will be 1//e after a time n/(9lamda) . Find the value of n ?