The activity of a radioactive nuclide `(X^(100))` is `6.023` curie at a certain time `t`. If its distintegration constant is `3.7times10^(4)s^(-1)`, the mass of `X` after `t` sec is:

The activity of a sample of radioactive element X^(100) is 6.02 curie. Its decay constant is 3.7 xx 10^(4) s^(-1) . The initial mass of the sample will be a. 10^(-6) g b. 10^(-8) g c. 10^(-20) g d. 10^(-15) g

The activity of a radioactive substance is R_(1) at time t_(1) and R_(2) at time t_(2)(gt t_(1)) . Its decay cosntant is lambda . Then .

The activity of a radioactive sample is 1.6 curie, and its half-life is 2.5 days . Its activity after 10 days will be

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.

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 .

The activity of a sample of a radioactive meterial is A_1 , at time t_1 , and A_2 at time t_2(t_2 gt t_1) . If its mean life T, then

The activity of a radioactive susbtance is R_(1) at time t_(1) and R_(2) at time t_(2) (>t1). its decay constant is λ. Then, number of atoms decayed between time interval t_(1) and t_(2) are

The fraction of a radioactive material which remains active after time t is 9//16 . The fraction which remains active after time t//2 will be .

The fraction of a radioactive material which reamins active after time t is 9//16 . The fraction which remains active after time t//2 will be .

The activity of a sample of radioactive material is R_(1) at time t_(1)andR_(2)"at time"t_(2)(t_(2)gtt_(1)) . Its mean life is T. Then,