NEET Physics Atoms Questions Solved

In Bohr's model, the atomic radius of the first orbit is ${\mathrm{r}}_{0}$, then the radius of the third orbit is
(a) $\frac{{\mathrm{r}}_{0}}{9}$               (b) ${\mathrm{r}}_{0}$
(c) $9{\mathrm{r}}_{0}$               (d) $3{\mathrm{r}}_{0}$

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