Work function of lithium and copper are ...

Work function of lithium and copper are respectively `2.3 eV` and `4.0 eV`. Which one of the metal will be useful for the photoelectric cell working with visible light ?
`(h = 6.6 xx 10^(-34) J - s, c = 3 xx 10^(8) m//s)`

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Work function of lithium and copper are respectively `2.3 eV` and `4.0 eV`. Which one of the metal will be useful for the photoelectric cell working with visible light ? `(h = 6.6 xx 10^(-34) J - s, c = 3 xx 10^(8) m//s)`

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Work function of lithium and copper are respectively `2.3 eV` and `4.0 eV`. Which one of the metal will be useful for the photoelectric cell working with visible light ?
`(h = 6.6 xx 10^(-34) J - s, c = 3 xx 10^(8) m//s)`