Two radioactive substances are having same initial number of nuclei. Disintegration constant of one substance is `10lamda`, other one `lamda` after how much time ratio of number of nuclei becomes `(1)/(e)`?

A radioactive substance is being produced at a constant rate of 200 nuclei/s. The decay constant of the substance is 1s^(-1) . After what time the number of radioactive nuclei will become 100. Initially there are no nuclei present ?

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 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 contain same number of nuclei. If 6lamdas^(-1) and 4lamdas^(-1) are the decay constants of X_1 and X_2 respectively, find the time after which ratio of number of nuclei undecayed of X_1 to that of X_2 will be 1/e

Two radioactive materials X_1 and X_2 contain same number of nuclei. If 6lamdas^(-1) and 4lamdas^(-1) are the decay constants of X_1 and X_2 respectively, find the time after which ratio of number of nuclei undecayed of X_1 to that of X_2 will be 1/e

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 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 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

Two raidoactive substances A and B Have decay constants 5lambda and lambda respectively. At t=0 they have the same number of nuclei.The ratio of number of nuclei of A to those of B will be after (1/e)^2 a time interval: