# NEET Physics Nuclei Questions Solved

The activity of a radioactive sample is measured 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 [2010]

(1)           (2) $\frac{5}{{\mathrm{log}}_{e}2}$           (3)         (4)