The radius of innermost electron orbit of a hydrogen atom is \( 4.2 \times 10^{-11} \mathrm{~m} ...
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0The radius of innermost electron orbit of a hydrogen atom is \( 4.2 \times 10^{-11} \mathrm{~m} \). What is the radius of orbit in second excited state?
(A) \( 3.8 \times 10^{-10} \mathrm{~m} \)
(B) \( 4.77 \times 10^{-10} \mathrm{~m} \)
(C) \( 5.1 \times 10^{-5} \mathrm{~m} \)
(D) None of these
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