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Why are potas...

Question

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

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Solution

The ionization potentials of potassium and cesium are lower than that of lithium. On exposure to light, potassium and caesium easily emit electrons however lithium does not. Hence, potassium and caesium are used in the photoelectric cell.

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

Q. Why potassium and calcium are used in photoelectric all in place of Lithium?

Q. Why do caesium (

C s

) and potassium (

K

) find applications in photoelectric cells?

Q. Assertion :Potassium and caesium are useful as electrodes in photoelectric cells. Reason: Potassium and caesium, when irradiated with light, the light energy absorbed is sufficient to eject out the electron from an atom.

Q. Read the assertion and reason carefully and answer the question on the basis of the following options. You have to select the one that best describes the two statements.

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

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