Q. Mean life of a radioactive sample is 100 s. Then its half-life(in minutes) is
A) 0.693
B) 1
C) $10^{- 4}$
D) 1.155
Explanation
(d) Half-life $T/2\ = \ \frac{T}{1.44}\ = \frac{100}{1.44}\ s\ = \ 69.44\ s$
= $\frac{69.44}{60} \approx$ 1.155 min
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.