Question

The ratio of radii of nuclei of two atoms of element of atomic mass numbers $27$ and $64$ is

• A. $3:4$
• B. $4:3$
• C. $9:16$
• D. $16:9$

Answer 1

Answer: (A)

Radius of a nucleus $R=R_0{A}^{\frac{1}{3}}[R_0\to$ constant $]$
So, $\frac{R_1}{R_2}={\left(\frac{27}{64}\right)}^{\frac{1}{3}}\frac{R_1}{R_2}=\frac{3}{4}$