The t(0.5) of a radioactive element is r...

The `t_(0.5)` of a radioactive element is related to its average life by the expression

`T_12=1.44 T_(av)`

`T_12=1.36 T_(av)`

`T_12=0.693 T_(av)`

`T_12= (T_(av))/0.693`

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