engineering physics MCQ #541

The ratio of the wavelengths of the first line of Lyman series and the first line of Balmer series is

engineering physics MCQ #541

  1. Question 1

    Q1. The ratio of the wavelengths of the first line of Lyman series and the first line of Balmer series is

    • A) 1 / 4
    • B) 5 / 27
    • C) 3 / 4
    • D) 4 / 5

    Answer: 5 / 27

    Explanation: For Lyman series, 1 / λ = R (1 - 1/4) = 3R / 4. For Balmer series, 1 / λ = R (1/4 - 1/9) = 5R / 36. Ratio = (5R / 36) / (3R / 4) = 5 / 27.