Decay constant of two radioactive samples is `lambda` and `3lambda` respectively. At `t = 0` they have equal number of active nuclei. Calculate when will be the ratio of active nuclei becomes `e : 1`.

Decay constant of two radioactive samples is lambda and 3lambda respectively. At t = 0 they have equal number of active nuclei. Calculate t , when will be the ratio of active nuclei becomes e : 1 .

Decay constants of two radio-active samples A and B are 15 x and 3x respectively . They have equal number of initial nuclei . The ratio of the number of nuclei left in A and B after a time (1)/(6x) is

Two radioactive nuclides A and B have decay constant 10lambda and lambda respectively. If initially they have same number of nuclei, calculate the ratio of nuclei of A and B after a time 1//9lambda

Half lives of two radioactive elements A and B are 20 minutes and 40 minutes respectively. Initially, the samples have equal number of nuclei. Calculate the ratio of decayed numbers of A and B nuclei after 80 minutes.

Two radioactive materials A and B have decay constants 10lambda and lambda , respectively. If initially they have the same number of nuclei, then the ratio of the number of nuclei of A of that of B will be 1//e after a time :