engineering physics MCQ #544

The ratio of the energies of the first orbit of hydrogen and helium is

engineering physics MCQ #544

  1. Question 1

    Q1. The ratio of the energies of the first orbit of hydrogen and helium is

    • A) 1 / 4
    • B) 1 / 2
    • C) 2 / 1
    • D) 4 / 1

    Answer: 1 / 4

    Explanation: E1(H) = -13.6 eV, E1(He+) = -54.4 eV, ratio = (-13.6) / (-54.4) = 1 / 4.