Question

One gram of a radioactive substance disintegrates at the rate of $3.7\times {10}^{10}$ disintegrations per second. The atomic mass of the substance is 226. Calculate its mean life:

Answer 1

$\frac{dN}{dt}=3.7\times {10}^{10}$

Mean life $=\frac{1}{\lambda }=\frac{1}{3.7\times {10}^{10}}$