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

  • (A) High melting point
  • (B) Low melting point
  • (C) Low work function
  • (D) Low resistance
  • Correct Answer - Option(C)
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Explanation by: Admin

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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