A light source of wavelength, $\backslash$lambda$,$ illuminates a metal and ejects photoelectrons with a maximum kinetic energy of $2\mathrm{.}00$eV$2\mathrm{.}00\backslash ,\backslash$text$\{$eV$\}2\mathrm{.}00$eV$.$ A second light source of wavelength $/2\backslash$lambda$/2$$/2$ ejects photoelectrons with a maximum kinetic energy of $4\mathrm{.}00$eV$4\mathrm{.}00\backslash ,\backslash$text$\{$eV$\}4\mathrm{.}00$eV$.$ What is the work function of the metal?