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The activity of a sample of radioactive...

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)`. It mean life is T .

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`A_1=A_o e^(-lambdat_1)` and `A_2=A_o e^(-lambdat_2) A_1/A_2=e^(lambda(t_2-t_1))`
`lambda(t_2-t_1)=ln|A_1/A_2|`
`tau-1/lambda -(t_2-t_1)/(ln|A_1/A_2|)`
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