engineering physics MCQ #368

The energy of the nth orbit of hydrogen-like atom is En = -13.6 Z² / n² eV. What is the energy of the 2nd orbit of Li++?

engineering physics MCQ #368

  1. Question 1

    Q1. The energy of the nth orbit of hydrogen-like atom is En = -13.6 Z² / n² eV. What is the energy of the 2nd orbit of Li++?

    • A) -30.6 eV
    • B) -54.4 eV
    • C) -122.4 eV
    • D) -13.6 eV

    Answer: -122.4 eV

    Explanation: For Li++, Z = 3, so E2 = -13.6 * 3² / 2² = -30.6 * 4 / 4 = -122.4 / 4 = -30.6 eV.