The kinetic energy of a photoelectron is 1.5 × 10⁻¹⁹ J when light of wavelength 400 nm is used. What is the work functio
E = hc/λ ≈ 4.970×10⁻¹⁹ J. W₀ = E - KE ≈ 3.470×10⁻¹⁹ J.
Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Electronic Configuration - Aufbau Pauli Hund and Stability