engineering physics MCQ #543

The wavelength of the photon emitted when an electron jumps from n = 2 to n = 1 in hydrogen atom is

engineering physics MCQ #543

  1. Question 1

    Q1. The wavelength of the photon emitted when an electron jumps from n = 2 to n = 1 in hydrogen atom is

    • A) 121.6 nm
    • B) 656.3 nm
    • C) 102.6 nm
    • D) 486.1 nm

    Answer: 121.6 nm

    Explanation: 1 / λ = R (1 - 1/4) = 3R / 4, λ = 4 / (3R) = 121.6 nm.