13.Nuclei
medium

રેડિયો એક્ટિવ તત્ત્વનાં સરેરાશ જીવનકાળ દરમિયાન વિઘટન કરનાર વિધેય.

A

$e$

B

$\frac{e-1}{e}$

C

$\frac{1}{e}$

D

$\frac{e}{e-1}$

Solution

(b)

In mean life $t=\frac{1}{\lambda}$

Fraction that disintegrates is $\frac{N_0-N_0 e^{-\lambda \times \frac{1}{\lambda}}}{N_0}=\left(\frac{1-e}{e}\right)$ Or magnitude $\left(\frac{1-e}{e}\right)$

Standard 12
Physics

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