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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Physics
Chapter
Atomic Physics

NTA Abhyas 2020 · Physics · Atomic Physics

If an electron in a hydrogen atom is in its 2 ^ nd excited state,...

If an electron in a hydrogen atom is in its 2nd{2}^{nd} excited state, orbiting the nucleus in a stationary orbit of radius 4.65A∘4. 65\overset{∘}{A}, then& its de-Broglie wavelength is

Options

  1. A12.9A∘12. 9\overset{∘}{A}
  2. B3.5A∘3. 5\overset{∘}{A}
  3. C9.7A∘9. 7\overset{∘}{A}
  4. D6.6A∘6. 6\overset{∘}{A}

Correct answer

C. 9.7A∘9. 7\overset{∘}{A}

Step-by-step solution

2\pir=nλ2\pir = n\lambda
⇒2π=3λ⇒ 2\pi = 3\lambda
λ=9.7A\lambda = 9. 7A
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