For silver meta, threshold frequency for the emission of photoelectron is $1.13\times {10}^{17}{s}^{-1}$. The kinetic energy of electrons emitted when silver is irradiated with wavelength 1.5 nm is

Energy carried by one photon of wavelength 1.5 nm is

            $E_1=\frac{hc}{\lambda }=\frac{(6.626\times {10}^{-34}Js)(3\times {10}^{8}m{s}^{-1})}{(1.5\times {10}^{-9}m)}=1.325\times {10}^{-16}J$

            Energy carried by one photon of frequency $1.13\times {10}^{17}{s}^{-1}is$

                                   $E_2=hv=(6.626\times {10}^{-34}Js)(1.13\times {10}^{17}{s}^{-1})=7.49\times {10}^{-17}J$ 

            Kinetic energy of a single electron is

                                    $\Delta E=E_1-E_2=(13.25-7.89)\times {10}^{-17}J=5.76\times {10}^{-17}J$