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Lithium is used photoelectric cells....

Lithium is used photoelectric cells.

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The correct Answer is:
F
Li does not exhibit photolectric effect as ionnisation energy of Li is much greater than the energy of photon (light), hence electron is not ejected.
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Assertion : Caesium is used in photoelectric cells. Reason : Caesium is most electropositive element.

Why are potassium and caesium, rather than lithium used in photoelectric cells ?

Why are potassium and caesium, rather lithium used in photoelectric cells?

Alkalimetals which are used in photoelectric cells are

K and Cs are used in photoelectric cells. K and Cs emit electrons on exposure to light.

Why are potassium and cesium, rather than lithium can be used in photoelectric cells ?

Why cesium can be used in photoelectric cell, while lithium cannot be ?