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)

$r\propto A^{1/3}$
$\frac{r_{Cs}}{r_{Ca}}={\left(\frac{135}{40}\right)}^{1/3}$
$\frac{r_{Cs}}{r_{Ca}}={\left(\frac{27}{8}\right)}^{1/3}$
$\frac{r_{Cs}}{r_{Ca}}=\frac{3}{2}$