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Which of the following alkali metals is ...

Which of the following alkali metals is frequently used as a cathode in the photoelectric cells ?

A

Cs

B

K

C

Na

D

Li

Text Solution

Verified by Experts

The correct Answer is:
A
Except Li, all alkali metals exhibit photoelectric effects, i.e., emit electrons from the surface on exposure to visible light. This is on account of their low ionization enthalpy, fails to do so. Because of the lowest ionization enthalpy, Cs is frequently used in solar cells.
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