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The maximum wavelength that an electromagneh'c wave can have to simply eject electrons with no additional energy on the electron from a metal surface, is

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The maximum wavelength that an electromagneh'c wave can have to simply eject electrons with no additional energy on the electron from a metal surface, is 668 nm. What is the work function W0 of this metal? Express your answer in electron volts. Round to 3 sig gs

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