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The plot of the number (N) of decayed at...

The plot of the number (N) of decayed atoms versus activity (R) of a radioactive substance is

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The correct Answer is:
D
We have, `N=N_(0)e^(-lamdat)and R=R_(0)e^(-lamdat)=lamdaN_(0)e^(-lamdat)`
`thereforeN_("decayed")=N_(0)-N=N_(0)e^(-lamdat)=N_(0)-(R)/(lamda)`
This is equation of straight line with negative slope.
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