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  2. Why are potassium and caesium, rather than lithium used in photoelectric cells?
# NCERT

10.9 Why are potassium and cesium, rather than lithium used in photoelectric cells?

Answers (1)
R Rakesh

It is because of the low ionisation energy of K and Cs. They lose electron easily. On the other hand, Lithium is smaller in size as compared to caesium and lithium, it requires high energy to lose an electron. Therefore, lithium is not used in a photoelectric cell.

 

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