Question

Two nuclei have mass numbers in the ratio $1:64$. What is the ratio of their nuclear radii ?

Answer 1

The relation between mass number A and nuclei radius R is given by $R=R_0{A}^{1/3}$

So, $\frac{R_1}{R_2}=\frac{A_1^{1/3}}{A_2^{1/3}}=(1/64{)}^{1/3}=1/4$