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
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 .
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 radioactive substance has 10^8 nuclei. Its half life is 30 s . The number of nuclei left after 15 s is nearly
At t=0 , number of radioactive nuclei of a radioactive substance are x and its radioactivity is y. Half-life of radioactive substance is T. Then,
Nuclei of radioactive element A are produced at rate 't^(2') (where t is time) at any time t . The element A has decay constant lambda . Let N be the number of nuclei of element A at any time t . At time t=t_(0), dN//dt is minimum. The number of nuclei of element A at time t=t_(0) is
The half-life of a sample of a radioactive substance is 1 hour. If 8 xx 10^10 atoms are present at t = 0 , then the number of atoms decayed in the duration t = 2 hour to t = 4 hour will be
The half life of a radioactive substance is T_(0) . At t=0 ,the number of active nuclei are N_(0) . Select the correct alternative.
