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American physicist Robert A Millikan (1868-1953) won the 1923 Nobel Prize in physics, in part for his work on the photoelectric effect. Assume that Millikan observed for a hypothetical metal amaximum kinetic energy of 0.522 eV when electrons were ejected with 428.8 nm light. When light of 255.6 nm was used, he observed amaximum kinetic energy of 2.57 eV Using these results. Calculate the work function. W0, for the metal, without knowing the value for Planck's constant.

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