Q. What will be ratio of radii of $Li^{7}$ nucleus to $Fe^{56}$ nucleus?
A) 1:3
B) 1:2
C) 1:8
D) 2:6
Explanation
(b) Nuclear radius is proportional to $\ A^{1/3}$
$\ \ \ \ \ \ \ \ \ \ R = R_{0}A^{1/3}$
$\therefore\ \ \ \ \ \ \ \frac{R_{1}}{R_{2}}\ = \left\lbrack \frac{7}{56} \right\rbrack^{1/3} = \frac{1}{2}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.