engineering physics MCQ #552

The wavelength of the spectral line emitted when an electron jumps from n = 3 to n = 1 is

engineering physics MCQ #552

  1. Question 1

    Q1. The wavelength of the spectral line emitted when an electron jumps from n = 3 to n = 1 is

    • A) 102.6 nm
    • B) 121.6 nm
    • C) 656.3 nm
    • D) 103.2 nm

    Answer: 102.6 nm

    Explanation: 1 / λ = R (1 - 1/9) = 8R / 9, λ = 9 / (8R) = 102.6 nm.