Can some please review this question and tell me if the working looks correct? Please advise of any mistakes i may have made. Thanks Q: UV radiation (wavelength = 250 nm) falls on a metal target, and electrons are liberated. If the maximum kinetic energy of these electrons is 1.00*10^-19 J, what is the lowest frequency EMR that will initiate a photocurrent on this target? A: E = Ø + K = h*(c/λ) Therfore Ø = ((h*c)/250*10^-9) - 1*10^-19 Which = 6.96*10^-19 J = h*f Therefore f = 1.05*10^15 Hz Is this what i am supposed to do? Thanks for any help!