Question

The radius of a nucleus of a mass number A is directly proportional to

• A. $A^3$
  
• B. $A$
  
• C. $A^{\frac{2}{3}}$
  
• D. $A^{\frac{1}{3}}$

Answer 1

The correct option is D $A^{\frac{1}{3}}$

$R=R_0{A}^{\frac{1}{3}}\Rightarrow R\propto A^{\frac{1}{3}}$.