The activity of a radioactive sample is measured as N0 counts per minute at t = 0 and N0/e counts per minute at t = 5 minutes. The time (in minutes) at which the activity reduces to half its value is –

Question

( A ) $5log_{10}{2}$
( B ) $\frac{5}{log_e 2}$
( C ) $log_e\frac{2}{5}$
( D ) $5 log_{e}{2}$