If `R""_(1),R""_(2)` are activity of radioactive element at time `t""_(1)t""_(2)(t""_(2)gtt""_(1))`. The correct expression for mean life of nuclide isA. `(t""_(2)-t""_(1))/("in"(R""_(1)//R""_(2)))`B. `(t""_(2)-t""_(1))"in"(R""_(1)//R""_(2))`C. `((t""_(2)-t""_(1)))/("in"(R""_(2)//R""_(2))`D. `("in"(R""_(2)//R""_(2)))/((t""_(2)-t""_(1)))`

If `R""_(1),R""_(2)` are activity of radioactive element at time `t""_

1.	If `R""_(1),R""_(2)` are activity of radioactive element at time `t""_(1)t""_(2)(t""_(2)gtt""_(1))`. The correct expression for mean life of nuclide isA. `(t""_(2)-t""_(1))/("in"(R""_(1)//R""_(2)))`B. `(t""_(2)-t""_(1))"in"(R""_(1)//R""_(2))`C. `((t""_(2)-t""_(1)))/("in"(R""_(2)//R""_(2))`D. `("in"(R""_(2)//R""_(2)))/((t""_(2)-t""_(1)))`
Answer» Correct Answer - a `t""_(2)="in"/lamdaxx1/R""_(2),t""_(1)="in"/lamdaxx1/R""_(1)`

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