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Practice question

MCQ

Question

The energy required to excite an electron from n = 2 to n = 5 in a hydrogen atom is 4.896 × 10⁻¹⁹ J. What is the wavelength of the absorbed photon? (h = 6.626 × 10⁻³⁴ J s, c = 3.0 × 10⁸ m s⁻¹)

Options

Choose one · Correct answer highlighted

Explanation

λ = hc/ΔE ≈ 406.1 nm.

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