Two radioactive samples `1` and `2` have equal number of nuclei initially. They have halg-lives of `10` seconds and `20` seconds. The ratio of number of nuclei of `1` and `2` at `t=60` seconds is :
Two radioactive nuclei have same number of nuclei initially and decay constants as 5lambda . And 4lambda respectively. The ratio of number of nuclei will be 1/e^(2) after 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, 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 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
Two radioactive material A and B have disintegration constants 10lambda and2lambda respectively. If initially they have same number of nuclei, then the ration of number of nuclei of A and B will be (1)/(e) after a time of :
Two radioactive materials X_(1) and X_(2) have decay constant 11 lambda and lambda respectively. If initially they have same number of nuclei, then ratio of number of nuclei of X_(1) to X_(2) will be (1)/(e^(2)) after a time
Two radioactive substance A and B have decay constants 5 lambda and lambda respectively. At t=0 they have the same number of nuclei. The ratio of number of nuclei of nuclei of A to those of B will be (1/e)^(2) after a time interval
Two radioactive materials A and B have decay constants 5lambda and lambda respectively. Initially both A and B have the same number of nuclei. The ratio of the number of nuclei of A to that of B will be 1/e , after the time x/(8lambda) then x is :
