engineering physics MCQ #600

The ratio of the wavelengths of the first two lines of Lyman series is

engineering physics MCQ #600

  1. Question 1

    Q1. The ratio of the wavelengths of the first two lines of Lyman series is

    • A) 1 : 1
    • B) 27 : 32
    • C) 4 : 3
    • D) 3 : 4

    Answer: 27 : 32

    Explanation: λ1 / λ2 = (1 / 4 - 1 / 9) / (1 / 4 - 1 / 16) = (5 / 36) / (3 / 16) = 20 / 27, λ2 / λ1 = 27 / 20 * (4/3) = 32 / 27 * (4/3) * (3/4) = 27 / 32.