The radius of innermost electron orbit of a hydrogen \( \mathrm{P} ...

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The radius of innermost electron orbit of a hydrogen
\( \mathrm{P} \)
atom is \( 4.2 \times 10^{-11} \mathrm{~m} \). What is the radius of orbit in
W
second excited state?
(1) \( 3.8 \times 10^{-10} \mathrm{~m} \)
(2) \( 4.77 \times 10^{-10} \mathrm{~m} \)
(3) \( 5.1 \times 10^{-5} \mathrm{~m} \)
(4) None of these
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