The half life of radioactive substance is T. Then the fraction of the substance that has decayed in time t is-

The half life of a radioactive substance is 20 days. If 2/3 part of the substance has decayed in time t_(2) and 1/3 part of it has decayed in time t_(1) then the time interval between t_(2) and t_(1) is (t_(2)-t_(1)) =…………….

The half life of a radioactive substance is 13 years. The decay constant is

The half life period of a radioactive substance is 10 year. The amount of the substance decayed after 40 years would be

The half-life period of a radioactive substance is 5 min . The amount of substance decayed in 20 min will be

The half-life period of a radioactive substance is 5 min . The amount of substance decayed in 20 min will be

Half-life of a radioactive substance is T. At time t_1 activity of a radioactive substance is R_1 and at time t_2 it is R_2 . Find the number of nuclei decayed in this interval of time.

Half-life of a radioactive substance is T. At time t_1 activity of a radioactive substance is R_1 and at time t_2 it is R_2 . Find the number of nuclei decayed in this interval of time.