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Why are potassium and cesium used in photoelectric cells?

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The Photoelectric cells are based on the theory of photo electric effect, where we consider that by providing sufficient energy we can excite the surface electrons so that they get replaced. read more

So, for the element to be used in photoelectric cell, that must have capacity to loose electron in even very low amount of energy supplied. Since, Cs is the most electropositive element of all so it has the minimum ionization energy and so contains the maximum capacity to loose electrons. This is why, Cesium is used in photoelectric cells. read more

Potassium and Cesium have low ionization energies. So, a low energy photon can also emit an electron from their atoms. Thus, they are used in photoelectric cells. Sodium and lithium have larger ionization energies as they are smaller in size and have higher effective nuclear charge. read more

Potasium and caesium have much lower ionization enthalpy than that of lithium. as a result, these metals exposure to light, easily emit electrons but lithium doesn`t therefore potassium and cesium rather than lithium used in photoelectric effect. read more

Potassium and Cesium have low ionization energies. So, a low energy photon can also emit an electron from their atoms. Thus, they are used in photoelectric cells. read more

Potassium can loose electron easily . Comparatively Lithium have high ionisation energy and low level of loosing electron while absorbing light energy. read more

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Photoelectric Effect and Photoelectric Cell - YouTube
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