Question

The half-life of radium is 1600 years. The mean life of radium is:

• A. $800$ years
• B. $2309$ years
• C. $3209$ years
• D. $2903$ years

Answer 1

Answer: (B)

$2309$ years

The half life of radium $=1600$ years

Therefore, Mean life $=\frac{t_{\frac{1}{2}}}{0.693}$

$=\frac{1600}{0.693}=2309$ years

Hence, the correct option is $B$