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What makes caesium and potassium useful ...

What makes caesium and potassium useful as electrodes in photoelectric cells?

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The ionisation energies of caesium and potassium are very small. When light falls on the surface of metals, the energy present in them is absorbed by the atoms on the surface of metal. The energy of light is sufficient to make an atom to lose electron. This property makes caesium and potassium useful as electrodes in photoelectric cells.
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Knowledge Check

  • The metal best used in photoelectric cells is

    A
    `Na`
    B
    `Mg`
    C
    `Al`
    D
    `Cs`

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