Work function of lithium and copper are respectively \( 2.3 \mathrm...

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Work function of lithium and copper are respectively \( 2.3 \mathrm{eV} \) and \( 4.0 \mathrm{eV} \). Which one of the
\( \mathrm{P} \) metal will be useful for the photoelectric cell

W working with visible light? \( \left(h=6.6 \times 10^{-34} \mathrm{~J}-\mathrm{s}\right. \), \( c=3 \times 10^{8} \mathrm{~m} / \mathrm{s} \) )
(1) Lithium
(2) Copper
(3) Both
(4) None of these
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