The work function of a metal is 2.5 eV. What is the maximum kinetic energy of electrons emitted when light of wavelength 300 nm shines on it?
Q1. The work function of a metal is 2.5 eV. What is the maximum kinetic energy of electrons emitted when light of wavelength 300 nm shines on it?
Answer: 2.14 eV
Explanation: Photon energy = hc/λ = 4.14 eV. Max KE = 4.14 - 2.5 = 1.64 eV ≈ 1.63 eV (rounding).