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The red edge of the photoelectric effect for a metal corresponds to a wavelength of $\lambda = 500$ nm. Find the work function of the electron. Planck's constant is $h = 6.63 \cdot 10^{-34}$ J·s and the speed of light is $c = 3 \cdot 10^8$ m/s.
Light falls on a metal, each photon of which has an energy of $h\nu = 4$ eV. The work function of this metal is $A = 2$ eV. Find the maximum kinetic energy of the photoelectrons.