When a beam of light strikes a gold surface (=5.1 ev), electrons are ejected with a maximum kinetic energy of 6.3 ev. What is the energy of the incident light?
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The maximum kinetic energy KEe of ejected electrons (photoelectrons) is given by KEe = hf − BE, where hf is the photon energy and BE is the binding energy (or work function) of the electron to the particular material.
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