Q. The half-life period of radium is $1600\ years$. Its average life time will be
A) $3200\ years$
B) $4800\ years$
C) $2319\ years$
D) $4217\ years$
Explanation
(c) Average life $\frac{1}{\lambda} = \frac{1600}{0.693} = 2308 \approx 2319\ years$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.