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Asked by Sagar Last Modified
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metals which emits the electoron when light of suitable frequency(= or < thresold frequency) falls on respective metals easlily, are commonly used for this pupose. in many case alkali metals like potassium, cesium, rubidium are used. copper and silicon is also used for this pupose in solar panels.
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Alkali metals used to have low ionisation enthalpies and therefore electrons are easily ejected when they are exposed to light. Among these alkali metals, Cesium has Lowest ionisation enthalpy and hence show photoelectric effect to the maximum extent and therefore it is preferred in photoelectric cells.
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