A neutron and a proton have the same de Broglie wavelength. What is the ratio of their velocities? (mₚ = 1.67 × 10⁻²⁷ kg
Since mₚ = mₙ, vₚ/vₙ = 1.
Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Quantum Mechanical Model - de Broglie Heisenberg and Schrodinger
