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Of the following wavelengths of light, which is the largest wavelength that could result in photoelectron...

Of the following wavelengths of light, which is the largest wavelength that could result in photoelectron production from a surface if the work function of the surface is 2.10 eV? a. 480 nm b. 520 nm c. 570 nm d. 680 nm e. 720 nm

Please explain how the answer is C! Thank you!

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