Q. Given a sample of $Radium$-$226$ having half-life of 4 days. Find the probability, a nucleus disintegrates after 2 half lives
A) 1
B) 1/2
C) 1.5
D) 3/4
Explanation
(d) $N = N_{0}\left( \frac{1}{2} \right)^{2} \Rightarrow \frac{N}{N_{0}} = \frac{1}{4}$
Probability $= 1 - \frac{N}{N_{0}} = 1 - \frac{1}{4} = \frac{3}{4}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.