1) The wavelength of light affects electron emission from metals. Shorter wavelengths (higher frequencies) are able to emit electrons from metals at lower thresholds. 2) Both the wavelength and intensity of light impact the photocurrent generated. Shorter wavelengths and higher intensities result in greater photocurrent. 3) There is a threshold frequency and energy for each metal, below which electron emission does not occur. Extra energy above the threshold is lost.