engineering physics MCQ #453

The wavelength of the photon emitted when an electron jumps from n = 4 to n = 2 is given by 1 / λ = R * (1 / 2² - 1 / 4²). What is λ?

engineering physics MCQ #453

  1. Question 1

    Q1. The wavelength of the photon emitted when an electron jumps from n = 4 to n = 2 is given by 1 / λ = R * (1 / 2² - 1 / 4²). What is λ?

    • A) 486.1 nm
    • B) 434.1 nm
    • C) 410.2 nm
    • D) 656.3 nm

    Answer: 486.1 nm

    Explanation: 1 / λ = R * (1/4 - 1/16) = R * 3/16. λ = 16 / (3*R) = 486.1 nm, using R = 1.097 * 10^7 m^-1.