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The activity of a sample of radioactive ...

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,

A

`A_2=A_1e^((t_1-t_2)//T)`

B

`A_1-A_2=t_2-t_1`

C

`A_1t_1=A_2t_2`

D

`A_2=A_1e^((t_1//t_2)T)`

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A
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