Question

Ratio of nuclear radii of ${}^{135}Cs$ to ${}^{40}Ca$ is

• A. $1.40$
• B. $1.50$
• C. $2.750$
• D. $3.375$

Answer 1

Answer: (B)

$1.50$

Radius of nuclei $R=R_0(A{)}^{1/3}$

where $R_0$ is a constant and $A$ is the mass number of the nuclei

so $\frac{R_{cs}}{R_{ca}}=(\frac{135}{40}{)}^{1/3}=1.5$