Part e

$(1$ points$)$

The electrons emitted at this wavelength $($Part c$)$ are just barely able to overcome a voltage difference of $0\mathrm{.}50\mathrm{.}5$V to get across to the collector plate.

From your answer to Part d$,$ what must be the binding energy of electrons $($the work function$)$ for potassium metal? Give your answer as a positive number in eV$.$