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

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

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 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 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.

A radioactive substance has 10^8 nuclei. Its half life is 30 s . The number of nuclei left after 15 s is nearly

A radioactive substance has 10^8 nuclei. Its half life is 30 s . The number of nuclei left after 15 s is nearly

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.