In Fig. X represents time and Y represents activity of a radioactive sample. Then activity of sample

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13.Nuclei

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In Fig. $X$ represents time and $Y$ represents activity of a radioactive sample. Then the activity of sample, varies with time according to the curve

A

$A$

B

$B$

C

$C$

D

$D$

Solution

Activity $=-\frac{\mathrm{dN}}{\mathrm{dt}}=\lambda \mathrm{N}=\lambda \mathrm{N}_{0} \mathrm{e}^{-\lambda t}$

i.e., graph between activity and $t,$ is exponential having negative slope.

Standard 12

Physics

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