The radius of a nucleus varies with its mass number (A) as
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → directly proportional to $\sqrt[3]{A}$
The radius of a nucleus is given by:
$R = R_{0} A^{\frac{1}{3}}$
Hence, it is directly proportional to $A^{\frac{1}{3}}$.
Answer: directly proportional to $(A)^{\frac{1}{3}}$