In a photoelectric effect experiment, which of the following changes by result in a current, if there was no current flowing previously? 1. decreasing voltage in apparatus 2. decreasing frequency of the incident light 3. making the incident light brighter 4. increasing wavelength of the incident light 5. making the color of the incident light bluer So I've done some research and I came across the fact that "Larger radiation intensity or frequency would produce more current." source: http://en.wikipedia.org/wiki/Photoelectric_effect So I've narrowed down the answer choices to 3 and 5. but not sure which one is right. can someone help me? thanks.