Question

The half life period of a radioactive element is 120 days. After 600 days, one gram of the element will reduced to

• A. $\frac{1}{16}g$
• B. $\frac{1}{32}g$
• C. $\frac{1}{8}g$
• D. $\frac{1}{64}g$

Answer 1

The correct option is B $\frac{1}{32}g$

$C_t=\frac{C_0}{2^n}$
n = no of half lives
$n=\frac{600}{120}=5;C_t=\frac{1}{(2{)}^5}=\frac{1}{32}gram$