Writer any two applications of phots cell
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A photo-emissive cell is a type of gas filled or vaccum tube that is sensitive to light. It makes use of photo electric effects, the phenomenon whereby light sensitive surface give off electrons when stuck by light. when photons strike the cathod the electrons in the ligh-sensitive substance absorb the energy. The electrons thus aquire enough energy to escape from the surface of the metal. So, when potential difference is applied, electrons move towards anode creating an electric current in opposite direction.
Applications i) controlling temperature of furnace ii) Automatic switching on and off of street bulbs iii) Reproducing sound in cinematography.
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