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Why are alkali metals most suited as pho...

Why are alkali metals most suited as photosensitive materials?

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Alkali metals have small work function. So even with a radiation of small energy, electrons can be ejected out of their surface. That is why alkali metals are most suitable for photoelectric emission.
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Knowledge Check

  • Which one of the following alkali metals is used in photoelectric cells ?

    A
    Li
    B
    Na
    C
    Cs
    D
    Fr

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