Assertion : Potassium and caesium are used in | vedclass

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(A) Potassium $(K)$ and caesium $(Cs)$ are alkali metals with very low ionisation enthalpy.Due to this low ionisation enthalpy,they can easily emit el

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If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

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(A) Potassium $(K)$ and caesium $(Cs)$ are alkali metals with very low ionisation enthalpy.Due to this low ionisation enthalpy,they can easily emit electrons when exposed to light (photoelectric effect).Because of this property,they are widely used in photoelectric cells.Therefore,the Reason correctly explains the Assertion.

Assertion : Potassium and caesium are used in photoelectric cells.
Reason : Potassium and caesium emit electrons on exposure to light.

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Assertion : Potassium and caesium are used in photoelectric cells.Reason : Potassium and caesium emit electrons on exposure to light.