The velocity of an electron in the first orbit of a hydrogen atom is 2.19 × 10⁶ m s⁻¹. What is its velocity in the third
v₃ = v₁/3 = 7.3×10⁵ m s⁻¹.
Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Atomic Models - Thomson Rutherford and Bohr Model