If an electron in a hydrogen atom is in its 2 nd excited state, orbiting the nucleus in a stationary orbit of radius 4 . 65 A ∘ , then its de-Broglie wavelength is

Question

If an electron in a hydrogen atom is in its 2 nd excited state, orbiting the nucleus in a stationary orbit of radius 4 . 65 A ∘ , then its de-Broglie wavelength is, 12 . 9 A ∘, 3 . 5 A ∘, 9 . 7 A ∘, 6 . 6 A ∘

MARKS App · Accepted Answer

2 π r = n λ ⇒ 2 π = 3 λ λ = 9 . 7 A

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