The work function of a metal is 2.5 eV. What is the maximum wavelength of light that can eject electrons from this metal
W₀ = 4.0×10⁻¹⁹ J. λmax = hc/W₀ ≈ 4.97×10⁻⁷ m = 497 nm.
Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Shapes of Orbitals - s p d f and Nodes and Radial Probability