engineering physics MCQ #360

The frequency of a spectral line is given by f = ΔE / h. What is the frequency of the photon emitted when an electron jumps from n = 2 to n = 1?

engineering physics MCQ #360

  1. Question 1

    Q1. The frequency of a spectral line is given by f = ΔE / h. What is the frequency of the photon emitted when an electron jumps from n = 2 to n = 1?

    • A) 2.46 x 10^15 Hz
    • B) 3.29 x 10^15 Hz
    • C) 4.57 x 10^15 Hz
    • D) 6.17 x 10^15 Hz

    Answer: 3.29 x 10^15 Hz

    Explanation: Calculate ΔE = E2 - E1, then f = ΔE / h = (-3.4 - (-13.6)) / h = 10.2 / h = 3.29 x 10^15 Hz (approx).