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The graph between the instantaneous conc...

The graph between the instantaneous concentration (N) of a radioactive element and time (t) is.

A

B

C

D

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The correct Answer is:
D
(d) By using `N = N_0 e^(-lambda t)` and `(dN)/(dt) = -lambda N`
It shows that `N` decreases exponentially with time.
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