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## Q. 12.3

Find the radii of the ${ }^{238} U \text { and }{ }^{4} He$ nuclei and then determine the ratio of those radii.

Strategy We use Equation (12.2) to determine the radii and then the ratio for the two nuclei.

$R=r_{0} A^{1 / 3}$ (12.2)

## Verified Solution

\begin{aligned}&R\left({ }^{238} U \right)=(1.2 fm )(238)^{1 / 3}=7.4 fm \\&R\left({ }^{4} He \right)=(1.2 fm )(4)^{1 / 3}=1.9 fm\end{aligned}

The ratio is

$\frac{R\left({ }^{238} U \right)}{R\left({ }^{4} He \right)}=\frac{7.4 fm }{1.9 fm }=3.9$

Even though ${ }^{238} U$ has 60 times the number of nucleons of ${ }^{4} He$, its radius is only four times greater.