Q. 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) $D$
Explanation
(b) Activity $= - \frac{dN}{dt} = \lambda N = \lambda N_{0}e^{- \lambda t}$
$i.e.,$ graph between activity and $t$, is exponential having negative slope
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.