Question

The order of radioactive disintegration is :

• A. first order
• B. second order
• C. zeroth order
• D. none of the above

Answer 1

The correct option is A first order

The order of radioactive disintegration is first order.
Rate of the reaction $=-\frac{dN}{dt}\propto N$
$-\frac{dN}{dt}=\lambda N$
Here, N represents the number of undecayed atoms of the isotope present in the given amount of sample.