engineering physics MCQ #390

The frequency of the radiation emitted when an electron falls from n = 4 to n = 3 in hydrogen atom is

engineering physics MCQ #390

  1. Question 1

    Q1. The frequency of the radiation emitted when an electron falls from n = 4 to n = 3 in hydrogen atom is

    • A) 1.6 x 10¹⁴ Hz
    • B) 3.2 x 10¹⁴ Hz
    • C) 4.57 x 10¹⁴ Hz
    • D) 2.46 x 10¹⁴ Hz

    Answer: 3.2 x 10¹⁴ Hz

    Explanation: Using ΔE = hf and En = -13.6 / n² eV, ΔE = E4 - E3 = 0.66 eV, f = ΔE / h = 3.2 x 10¹⁴ Hz (approx).