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The work function of unknown metal surface is o = 7.54 ev, find the minimum wavelength that light must have to eject electrons from this

The work function of unknown metal surface is o = 7.54 ev, find the minimum wavelength that light must have to eject electrons from this surface. A. 237.59 mm B. 112.73 mm C. 476.88 nm D. 164.43 nm

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