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The Bohr's orbit radius for the hydrogen atom (n = 1) is approximately 0.530A^o. The radius for the first excited state (n = 2) orbit is

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4.77 A°

2.22 A°

1.06 A°

0.13 A°

answer is D.

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Detailed Solution

$r = \frac{0530 \times n^{2}}{Z} F i r s t e x c i t e d s t a t e n = 2 r = \frac{0530 \times 2^{2}}{1} = 2.22 A^{o}$

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