Why are potassium and caesium, rather than lithium used in photoelectr – InterviewSolution

1.	Why are potassium and caesium, rather than lithium used in photoelectric cells ?
Answer» Potassium and caesium have much lower ionization enthalpy than that of lithium. As a result, these metals on exposure to light, easily emit electrons but lithium does not. Therefore, K and Cs rather than Li are used in photoelectric cells.

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