Work functions of lithium and copper are 2.3 eV and 4.0 eV, respectively. Which of these metals….

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Work functions of lithium and copper are 2.3 eV and 4.0 eV, respectively. Which of these metals will be useful for a photoelectric cell working with visible light? (h = 6.6 x 10^-34 J – s, c = 3 x 10⁸ m/s)

Options :-

1. Lithium
2. Copper
3. Both (1) and (2)
4. None of these

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