# NEET Physics Nuclei Questions Solved

If the decay or disintegration constant of a radioactive substance is $\mathrm{\lambda }$, then its half life and mean life are respectively
(a) $\frac{1}{\mathrm{\lambda }}$ and  $\frac{{\mathrm{log}}_{\mathrm{e}}2}{\mathrm{\lambda }}$              (b) $\frac{{\mathrm{log}}_{\mathrm{e}}2}{\mathrm{\lambda }}$ and $\frac{1}{\mathrm{\lambda }}$

(c) ${\mathrm{\lambda log}}_{\mathrm{e}}2$ and $\frac{1}{\mathrm{\lambda }}$               (d) $\frac{\mathrm{\lambda }}{{\mathrm{log}}_{\mathrm{e}}2}$ and $\frac{1}{\mathrm{\lambda }}$

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