A radioactive sample has initial concentration `N_(0)` of nuclei. Then,

Two samples of different radioactive substances initially have the ratio of active nuclei 4 : 1 and then half lives are 12 hr. and 16 hr. respectively. Find the ratio of active nuclei of the two samples after 2 days.

A radioactive sample has a half-life of 10 minutes. If 64 nuclei are contained in the sample the number of nuclei that would decay after 50 minutes is

A radioactive sample X has thrice the number of nuclei and activity one-third as compared to other radioactive sample Y. The ratio of half-lives of X and Y is

For a radioactive sample, at given instant, number of active nuclei is N and its decay constant is lambda then the incorrect relation is–

If N_(0) is the number of radioactive nuclei initially present , then the number of nuclei remaining undecayed at the end of nth half life is

A radioactive sample contains two different types of radioactive nuclei. A-with half-time 5 days and B-type with half life 30 days. Initially the decay rate of A-type nuclei is 64 times that of B type of nuclei . Their decay rates will be equal when time is 9n days. Find the value of n.

A radioactive sample has 8.0xx10^(18) active nuclei at a certain instant. How many of these nuclei will still be in the active state after two half-life ("in" xx10^(18)) ?

A radioactive sample has 8.0xx10^(18) active nuclei at a certain instant. How many of these nuclei will still be in the active state after two half-life ("in" xx10^(18)) ?