The ratio of the velocities of an electron in the second orbit of H to the third orbit of Li²⁺ is: (v₁ for H = 2.19 × 10
For H (Z=1), v₂ = 2.19×10⁶ / 2 = 1.095×10⁶ m s⁻¹. For Li²⁺ (Z=3), v₃ = 3 × 2.19×10⁶ / 3 = 2.19×10⁶ m s⁻¹. Ratio = 0.5.
Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Developments Leading to Bohr Model - Electromagnetic Radiation and Spectrum