Describe the process of photo emission. State the application of photo emission in electronic components

Describe the process of photo emission. State the application of photo emission in electronic components
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Process of Photoemission:when light of appropriate frequency and intensity is incident upon a surface of certain materials,the energy of light is given to electrons to leave the surface of metal this phenomenon is known as photoemission.

Application of photo emission in electronic components:photoemission are used in photo cathode which are widely used in automation and for remote control of industrial process.

Photoemissive cells or photo tubes are used in door openers,counters, position and temperature control and colour analysis 
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