engineering physics MCQ #520

The Lyman series corresponds to transitions to n = 1. What is the wavelength of the first line of the Lyman series?

engineering physics MCQ #520

  1. Question 1

    Q1. The Lyman series corresponds to transitions to n = 1. What is the wavelength of the first line of the Lyman series?

    • A) 121 nm
    • B) 102 nm
    • C) 91 nm
    • D) 122 nm

    Answer: 121 nm

    Explanation: Using the Rydberg formula for n = 2 to n = 1 transition, 1 / λ = R * (1 / 1² - 1 / 2²) = R * (3 / 4), λ = 4 / (3 * R) = 121 nm.