engineering physics MCQ #527

The frequency of a spectral line emitted by hydrogen atom is given by f = Rc (1 / n₁² - 1 / n₂²). What is the frequency of the first line of Lyman series?

engineering physics MCQ #527

  1. Question 1

    Q1. The frequency of a spectral line emitted by hydrogen atom is given by f = Rc (1 / n₁² - 1 / n₂²). What is the frequency of the first line of Lyman series?

    • A) 2.47 x 10¹⁵ Hz
    • B) 3.29 x 10¹⁵ Hz
    • C) 1.23 x 10¹⁵ Hz
    • D) 4.57 x 10¹⁵ Hz

    Answer: 3.29 x 10¹⁵ Hz

    Explanation: For the first line of Lyman series, n₁ = 1 and n₂ = 2. f = Rc (1 / 1² - 1 / 2²) = Rc (3 / 4) = 3.29 x 10¹⁵ Hz.