Question

$2gm$ of radio active element undergoes $3.7\times 10$${}^8$ disintegrations per second. Its curie value is

• A. $2g$
• B. $0.02g$
• C. $200g$
• D. $3700g$

Answer 1

The correct option is C $200g$

$R=\lambda N=\frac{dN}{dt}$,

$1G=3.7\times {10}^{10}$ decay/sec

$R=3.7\times {10}^8$ decay/sec

$R=\left(0.01\right)G$

$0.01=\frac{2}{\lambda }$

$\Rightarrow \lambda =200$