engineering physics MCQ #548

The wavelength of the first line of Paschen series is given by 1 / λ = R (1/9 - 1/16).

engineering physics MCQ #548

  1. Question 1

    Q1. The wavelength of the first line of Paschen series is given by 1 / λ = R (1/9 - 1/16).

    • A) 820 nm
    • B) 1875 nm
    • C) 1282 nm
    • D) 1094 nm

    Answer: 1875 nm

    Explanation: 1 / λ = R (1/9 - 1/16) = 7R / 144, λ = 144 / (7R) = 1875 nm.