why are alkali metal surfaces most suited as photo-sensitive surfaces?
prasanjeet kumar , 11 Years ago
Grade 8
General Physics> why are alkali metal surfaces most suited...
1 Answers
Apoorva Arora
Last Activity: 10 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.
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
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