Work function of lithium and copper are respectively 2.3 eV and 4.0 eV – McqOptions

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1.	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 ´ 10?34 J-s, c = 3 ´ 108 m/s) [DPMT 2003]
A.	Lithium
B.	Copper
C.	Both
D.	None of these
Answer» B. Copper

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