A) Cs
B) Na
C) K
D) Li
Correct Answer: A
Solution :
The phenomenon of emission of electrons from surface of metal by exposing it to visible light is called photoelectric effect. All alkali metals (except lithium) exhibit photoelectric effect. This ability to exihibit photoelectric effect is due to exhibit photoelectric effect is due to low value of their ionisation energies. Among alkali metals Cs having least ionisation energy exhibit maximum photoelectric effect.
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