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why are alkali metal surfaces most suited as photo-sensitive surfaces?

why are alkali metal surfaces most suited as photo-sensitive surfaces?

Grade:8

1 Answers

Apoorva Arora IIT Roorkee
askIITians Faculty 181 Points
9 years ago
Their work funtions are smallest among all metals. So electrons come out easily.
Na - 2.6 eV, K - 2.4 eV and Cs has the lowest work function in the first group 2.2 e V
If you calculate work function corresponding to blue light of 400 nm, you will get 3.1 eV. So even visible light can eject electrons from alkali metal surface.
Thanks and Regards
Apoorva Arora
IIT Roorkee
askIITians Faculty

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