Radioactive disintegration is a first order reaction and its rate depends only upon the nature of nucleus and does not depend upon external factors like temperature and pressure. The rate of radioactive disintegration (Activity) is represented as
`-(dN)/(dt)=lambdaN` Where `lambda=` decay constant, N= number of nuclei at time t, `N_(0)` =intial no. of nuclei. The above equation after integration can be represented as
`lambda=(2.303)/(t)log((N_(0))/(N))`
What is the activity in Ci (curie) of 1.0mole plutonium `-239` ? `(t_(1//2)=24000` years)
a) `1.49` Ci
b) `14.9` Ci
c) `5.513xx10^(11)` Ci
d) None of these

Options

A. `1.49` Ci
B. `14.9` Ci
C. `5.513xx10^(11)` Ci
D. `None of these

Answer

B