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  4. Ratio of nuclear radii of 135 Cs to 40 Ca is

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

Nuclei

Solution:

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