1. The problem statement, all variables and given/known data Light with a wavelength 600 nm is directed at a mettalic surface with a work function of 1.6 eV. A retarding potential of 0.5 V is applied. Determine: a) The maximum kinetic energy, in joules, of an emitted electron before the retarding potential is applied. b) The maximum speed with which an electron reaches the far side after the retarding potential is applied. 2. Relevant equations Kinetic Energy = hf - w 3. The attempt at a solution I used the above equation to figure out "a" but, I do not know where to begin question "b."