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     EduGorilla 
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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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