$4$ pts

Electrons are ejected from a metallic surface with speeds ranging up to $3\mathrm{.}70$e$5$m$/$s when light with a wavelength of $=625$$=625$nm is used.

$($a$)$

What is the work function of the surface? Hint:$$These electrons are not relativistic, so you may use $12$mv$212$mv$2$ for the kinetic energy.

eV $(0\mathrm{.}02$ eV$)$

$($b$)$

What is the cutoff frequency for this surface?

Hz $(2$E$12$ Hz$)$