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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

Options

  1. A12 . 9   A ∘
  2. B3 . 5 A ∘
  3. C9 . 7 A ∘
  4. D6 . 6   A ∘

Correct answer

C. 9 . 7 A ∘

Step-by-step solution

2 π r = n λ ⇒ 2 π = 3 λ λ = 9 . 7 A

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