Dual Nature Of Radiation

A metal surface of work function \(1 \cdot 13 \mathrm{~eV}\) is irradiated with light of wavelength \(310 \mathrm{~nm}\). The retarding potential required to stop the escape of photoelectrons is [Take \(\frac{\mathrm{hc}}{\mathrm{e}}=1240 \times 10^{-9} \mathrm{SI}\) units]