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Discussion :: Physics

  1. For photoelectric effect to take place, the metal used as the cathode should have ________

  2. A.

     High melting point

    B.

     Low melting point

    C.

     Low work function

    D.

     Low resistance

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    Answer : Option C

    Explanation :

    The photoelectric effect is the propensity of high energy electromagnetic radiation to eject electrons from a given material. The photoelectric effect has been utilized in devices called photocells, consisting of two electrodes in a sealed vacuum tube. By coating one electrode (the photocathode) with a alkali metal of low work function, a photo current could be generated even from visible light. Work function is the minimum energy needed to remove an electron from the surface of a material.


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