Question

The half life of a radio active element is $10$hours. Its average life is:

• A. $0.144hour$
• B. $14.4hour$
• C. $14.4hou{r}^{-1}$
• D. $14.4sec$

Answer 1

Answer: (B)

$14.4hour$

$t_{1/2}=10hr$

$t_{avg}=$ $\frac{1}{\lambda }=\frac{10}{.693}$$=14.43hr$