Question

The decay constant for the ends product of a radioactive series is

• A. Zero
• B. Infinity
• C. 1
• D. 2

Answer 1

The correct option is B Infinity

It is known that, rate of disintegration is directly proportional to the number of atoms present.

$\frac{-dN}{dt}\propto N$

$\frac{-dN}{dt}=\lambda N\lambda =decayconstant$

$N=N_0{e}^{-\lambda t}$

The above expression shows that number of radioactive atoms decreases exponentially with time. So the life of radioactive atom is infinite.