The work functions of Cesium (Cs), Potassium (K) and Sodium (Na) are 2.14 eV, 2.30 eV and 2.75 eV respectively. If incident electromagnetic radiation has an incident energy of 2.20 eV, which of these photosensitive surfaces may emit photoelectrons? NEET UG 2023
Basic Fact- For photoelctric emission to occur incident radiation must have energy(E) equal to or greater than work function(W) of the material, for given question E exceeds W for Cs only.