If \( r_{1} \) is the radius of the first orbit of hydrogen atom, then the radii of second, thir...

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If \( r_{1} \) is the radius of the first orbit of hydrogen atom, then the radii of second, third and fourth orbitals in terms of \( r_{1} \) are:
(a) \( \mathrm{r}_{1}^{2}, \mathrm{r}_{1}^{3}, \mathrm{r}_{1}^{4} \)
(b) \( 8 r_{1}, 27 r_{1}, 64 r_{1} \)
(c) \( 4 \mathrm{r}_{1}, 9 \mathrm{r}_{1}, 16 \mathrm{r}_{1} \)
(d) \( 2 r_{1}, 6 r_{1}, 8 r_{1} \)
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