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?

Einstein’s photoelectric equation relates an emitted electron’s maximum kinetic energy to the light’s frequency: higher frequency means more energy per photon and more energy available to the electron. Increasing the intensity of red light adds more photons, but does not increase each photon’s energy. Kumar should use a higher-frequency color of light, so the correct choice is “Use a different colored light that has a higher frequency.”

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