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Why alkali metals used in photoelectric cells?

Why alkali metals used in photoelectric cells?

Grade:12

1 Answers

Anjali Ahuja
askIITians Faculty 240 Points
7 years ago
Since alkali metals emit electrons when radiation strikes on their surfaces. This phenomenon of emission of electrons when electromagnetic radiation strikes against them is called photoelectric effect. Therefore, alkali metals exhibit photoelectric effect.
One more thing--> Alkali metals used to have low ionisation enthalpies and therefore, the electrons are easily ejected when exposed to light. Among alkali metals, cesium has lowest ionisation enthalpy and hence it can show photoelectric effect to the maximum extent and therefore preffered in photoelectric cell.

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