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13.Nuclei
easy
Ratio of nuclear radii of ${ }^{135} Cs$ to ${ }^{40} Ca$ is
A
$1.40$
B
$1.50$
C
$2.750$
D
$3.375$
Solution
(b)
$r \propto A^{1 / 3}$
$\frac{r_{C s}}{r_{C a}}=\left(\frac{135}{40}\right)^{1 / 3}$
$\frac{r_{C s}}{r_{C a}}=\left(\frac{27}{8}\right)^{1 / 3}$
$\frac{r_{C s}}{r_{C a}}=\frac{3}{2}$
Standard 12
Physics
