1) The half-life period and the mean life period of a radioactive element are denoted respectively by Th and Tm. Then A) $T_{h} = T_{m}$ B) $T_{h}>T_{m}$ C) $T_{h}<T_{m}$ D) $T_{h}\geq T_{m}$ Answer: Option CExplanation:Half-life Th = $\frac{0.693}{\lambda}, T_{m}= \frac{1}{\lambda}$ Clearly, $T_{h}< T_{m}$
