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? [2023]
K only
Na only
Cs only
Both Na and K
(3)
.
Electrons are emitted only when the incident energy is more than work function.
So, so option (3) is correct.
