Q. After five half lives what will be the fraction of initial substance
A) $\left( \frac{1}{2} \right)^{10}$
B) $\left( \frac{1}{2} \right)^{5}$
C) $\left( \frac{1}{2} \right)^{4}$
D) $\left( \frac{1}{2} \right)^{3}$
Explanation
(b) $\frac{N}{N_{0}} = \left( \frac{1}{2} \right)^{n} = \left( \frac{1}{2} \right)^{5}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.