PHOTOELECTRIC CELL...

PHOTOELECTRIC CELL

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A photocell or photoelectric cell is a device in which light energy is converted into electrical energy by photoelectric effect.
Constuction : A photoelectric cell as shown in the figure consists of a sealed glass tube enclosing as emitter (cathode) and a collector (anode). The cell is either highly evacuated (for accurate photomety) or filled with an inert gas at low pressure (if larger current is desired). The light enters through a quartz window W and falls on the semicylindrical cathode C coated with a photosensitive metal. The anode is in the form of straight wire of plantinum or nickel, coaxial with the cathode. For visible light, the cathode is coated with potassium or rubidium and the quartz window is replaced by a glass window. If only UV radiation is to be used., cadmium is used as the sensitive surface.
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PHOTOELECTRIC CELL
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