Physics Question 27 – NEET-UG 2023

The work functions of Caesium (Cs), Potassium (K) and Sodium (Na) are $2.14\text{ eV}$, $2.30\text{ eV}$ and $2.75\text{ eV}$ respectively. If incident electromagnetic radiation has an incident energy of $2.20\text{ eV}$, which of these photosensitive surfaces may emit photoelectrons?