Practice question

MCQ

Question

What is the wavelength of light emitted when an electron in a hydrogen atom falls from n = 3 to n = 1? (RH = 1.097 × 10⁷ m⁻¹, c = 3.0 × 10⁸ m s⁻¹)

Choose one · Correct answer highlighted

102.5 nm Correct 121.6 nm 656.3 nm 486.1 nm

ν̄ = RH (1 - 1/9) = 9.753×10⁶ m⁻¹. λ = 102.5 nm.

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