Q. If half life of radium is 77 days. Its decay constant in day will be
A) $3 \times 10^{- 13}/day$
B) $9 \times 10^{- 3}/day$
C) $1 \times 10^{- 3}/day$
D) $6 \times 10^{- 3}/day$
Explanation
(b) $\lambda = \frac{0.693}{T_{1/2}} = \frac{0.693}{77} = 9 \times 10^{- 3}/day$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.