Google+ Google Mechatronics Rockz: TYPES OF ELECTRON EMISSION

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Sunday, 13 January 2013

TYPES OF ELECTRON EMISSION

3.Photo-electric emission:when the surface of certain metals are
exposed to a beam of light,electrons are ejected out of the metal by
the light photons incident on the metal surface.Such an electron
emission is known as photo-electric emission and mostly used in
photo-electric cell.The greater the intensity of light beam falling on
the metal surface,the greater is photo-electric emission.
4.Secondary emission:When a beam of high velocity
electrons strike a metal surface,the free electrons are ejected out of
the metal.This process is known as secondary emission. 17:48
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