The activity of a radioactive sample is ...

The activity of a radioactive sample is measures as `N_0` counts per minute at `t = 0` and `N_0//e` counts per minute at `t = 5 min`. The time (in minute) at which the activity reduces to half its value is.

`log_e2//5`

`5/(log_e2)`

`5 log_(10)2`

`5 log _e 2`

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