engineering physics MCQ #440

The wavelength of the second line of Balmer series is given by 1 / λ = R * (1 / 2² - 1 / 4²). What is λ?

engineering physics MCQ #440

  1. Question 1

    Q1. The wavelength of the second line of Balmer series is given by 1 / λ = R * (1 / 2² - 1 / 4²). What is λ?

    • A) 486 nm
    • B) 434 nm
    • C) 410 nm
    • D) 656 nm

    Answer: 486 nm

    Explanation: 1 / λ = R * (1/4 - 1/16) = 3R/16, λ = 16 / (3R) = 486 nm.