engineering physics MCQ #401

The wavelength of the photon emitted when an electron jumps from n = 3 to n = 1 is given by 1 / λ = R [1/1² - 1/3²]. What is λ?

engineering physics MCQ #401

  1. Question 1

    Q1. The wavelength of the photon emitted when an electron jumps from n = 3 to n = 1 is given by 1 / λ = R [1/1² - 1/3²]. What is λ?

    • 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.