In Fig. X represents time and Y represent 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 $Y$ represent 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

(b) Activity $ = – \frac{{dN}}{{dt}} = \lambda N = \lambda \;{N_0}{e^{ – \lambda t}}$

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

Standard 12

Physics

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