Two radioactive substances have half-lives T and 2T. Initially, they have equal number of nuclei. After time `t=4T`, the ratio of their number of nuclei is x and the ratio of their activity is y. Then,

Two radioactive substances A and B have half lives of T and 2T respectively. Samples of a and b contain equal number of nuclei initially. After a time 4T , the ratio of the number of undecayed nuclei of A to the number if undecayed nuclei of A to the number of undeacyed nuclei of B is

Half-life of a radioactive substance A and B are, respectively, 20 min and 40min . Initially, the samples of A and B have equal number of nuclei. After 80 min , the ratio of the ramaining number of A and B nuclei is

Half-life of a radioactive substance A and B are, respectively, 20 min and 40min . Initially, the samples of A and B have equal number of nuclei. After 80 min , the ratio of the ramaining number of A and B nuclei is

Two radioactive substances A and B have decay constants 5lamda and lamda respectively. At t-0, they have the same number of nuclei. The ratio of number of nuclei of A to that of B will be (1//e)^(2) after a time interval of

Half-lives of two radioactive substances A and B are respectively 20 minutes and 40 minutes. Initially, he sample of A and B have equal number of nuclei. After 80 minutes the ratio of the remaining number of A and B nuclei is :

Half-lives of two radioactive substances A and B are respectively 20 minutes and 40 minutes. Initially, he sample of A and B have equal number of nuclei. After 80 minutes the ratio of the remaining number of A and B nuclei is :

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 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 :

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