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The metal mainly used in devising photoelectric cells is :

(1) Li

(2) Rb

(3) Cs

(4) Na
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The S block elements, Group 1 elements :Alkali Metals

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Ans. (3) Cs

Sol. Cesium has lowest ionisation enthalpy and hence it can show photoelectric effect to the maximum extent hence it is used in photo electric cell.

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