A radioactive nucleus can decay by two d...

A radioactive nucleus can decay by two different processes . The half life for the first process is `t_1` and that for the second process is `t_2`. If effective half life is t, then

`(t_1+t_2)/2`

`t_1+t_2`

`sqrt(t_1t_2)`

`(t_1t_2)/(t_1+t_2)`

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