engineering physics MCQ #603

The radius of the 2nd orbit of hydrogen atom is 2.12 Å. What is the radius of the 1st orbit?

engineering physics MCQ #603

  1. Question 1

    Q1. The radius of the 2nd orbit of hydrogen atom is 2.12 Å. What is the radius of the 1st orbit?

    • A) 0.53 Å
    • B) 1.06 Å
    • C) 2.12 Å
    • D) 4.24 Å

    Answer: 0.53 Å

    Explanation: r2 = 4 * r1, r1 = r2 / 4 = 2.12 / 4 = 0.53 Å.