Kumar is producing the photoelectric effect by using red light. He wants to increase the energy of emitted electrons. Based on the research of Albert Einstein, what is the best way for him to do this?

The energy of a photoelectron depends on the frequency of the light, according to Einstein’s equation: electron energy = photon energy minus the metal’s work function, with photon energy increasing as frequency increases. So Kumar should use a higher-frequency color of light. Changing the intensity changes the number of emitted electrons, not their energy; lower-frequency light would reduce their energy.

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