in this problem, you calculated that when the wavelength of incoming photons goes down by a factor of two, from 800 nmnm to 400 nmnm , the stopping potential required increases by more than a factor of three, from 0.6 vv to 2.15 vv . in general, for a real material with a positive work function, how will the stopping potential change when the wavelength goes down by a factor of nnn ?