Assuming the visible region of the spectrum to be from 4000 angstrom to 7500 angtrom ,calculate the maximum work function - Physics - Dual Nature Of Radiation And Matter

Question

Assuming the visible region of the spectrum to be from 4000
angstrom to 7500 angtrom ,calculate the maximum work function in
electron volt of a photo cathod that can emit electron with visible
light of any wavelength

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Assuming the visible region of the spectrum to be from 4000 angstrom to 7500 angtrom ,calculate the maximum work function in electron volt of a photo cathod that can emit electron with visible light of any wavelength.