If $r_1$ and $r_2$ are the radii of the atomic nuclei of mass number $64$ and $125$ respectively, then the ratio $(r_1/r_2)$ is
If $r_1$ and $r_2$ are the radii of the atomic nuclei of mass number $64$ and $125$ respectively, then the ratio $(r_1/r_2)$ is
- A
$\frac{64}{125}$
- B
$\sqrt {\frac{{64}}{{125}}} $
- C
$\frac{5}{4}$
- D
$\frac{4}{5}$
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