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If the threshold frequency for a photoemissive surface is 3.95 E 14 Hz, what is the work function for the surface? 1.25 eV 1.64 eV

If the threshold frequency for a photoemissive surface is 3.95 E 14 Hz, what is the work function for the surface? 1.25 eV 1.64 eV 1.89 eV 2.12 eV

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