At time `t=0` , number of nuclei of a radioactive substance are 100. At `t=1` s these numbers become 90. Find the number of nuclei at `t=2 s`.

At time t = 0 , number of nuclei of a radioactive substance is 100. At t = 1 s this number becomes 90. Find the number of nuclei at t = 2s.

Number of nuclei of a radioactive substance are 1000 and 900 at times t=0 and time t=2 s . Then, number of nuclei at time t=4s will be

Number of nuclei of a radioactive substance are 1000 and 900 at times t=0 and time t=2 s . Then, number of nuclei at time t=4s will be

Number of nuclei of a radioactive substance at time t=0 are 2000 and 1800 at time t=2 s. number of nuclei left after t=6s is

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.

A radio nuclide X is produced at constant rate alpha . At time t=0 , number of nuclei of X are zero. Find (a) the maximum number of nuclei of X. the number of nuclei at time t. Decay constant of X is lambda .

A radio nuclide X is produced at constant rate alpha . At time t=0 , number of nuclei of X are zero. Find (a) the maximum number of nuclei of X. the number of nuclei at time t. Decay constant of X is lambda .

At time t=0 , activity of a radioactive substance is 1600 Bq, at t=8 s activity remains 100 Bq. Find the activity at t=2 s.