NEET Chemistry The s-Block Elements Questions Solved

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.

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(A) Potassium and caesium have low ionisation energies and, therefore, their valence shell electrons
can be easily eject out by the energy of light.

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