Atomic Structure

Step 1: Understanding the orbital velocity.
The orbital velocity of an electron in an orbit is given by the equation: where is a constant, is the atomic number, and is the radius of the orbit. The radius of the orbit is related to the principal quantum number by: Thus, the velocity is inversely proportional to the square of the principal quantum number: Step 2: Finding the ratio.
Therefore, the ratio is given by: Step 3: Conclusion.
Thus, the ratio is , corresponding to option (B).