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 sample of a radioactive material is A_(1) at time t_(1) and A_(2) at time t_(2) , ( t_(2) gt t_(1)) . Its mean life is T. Then ______ .

The activity of a sample of radioactive material A_(1) at time t_(1) and A_(2) at time t_(2)(t_(2)gtt_(1)) . Its mean life is T .

The activity of a sample of radioactive material is A_1 at time t_1 and A_2 at time t_(2)(t_2 gt t_1) . Obtain an expression for its mean life.

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,

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,

The activity of a sample of radioactive material is A_1 at time t_(1) and A_(2) at time t_(2)(t_(2) le t_(1)) . Obtain an expression for its mean life.

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 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 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