Dual Nature of Radiation and Matter

•    The phenomenon of emission of electrons from the surface of a metal is known as electron emission.
•    There are three types of electron emission: thermionic emission, field emission and photoelectric emission.
•    The photoelectric effect is the emission of electrons from metallic surfaces when a light of suitable frequency fall on it.


•    The famous scientists Hertz, Hallwarch and Lenard investigate the phenomenon of photoelectric emission.
•    Experimental study of photoelectric effect tells about the effect of intensity on photocurrent, effect of potential on photoelectric effect and effect of frequency of incident radiation on stopping potential.
•    The relation between kinetic energy and frequency of the electrons emit during photoelectric emission is given by Einstein’s photoelectric equation.
•    Through the effect of photoelectric emission Einstein proved the particle nature of light.
•    Photocell is a device whose electrical properties are affected by light and works on the principle of photoelectric effect.
•    De Broglie attributed a wave like nature to matter or material particles. The waves associated with the particles of a moving material are called matter waves or de Broglie waves.
•    De Broglie wavelength associated with a moving particle is related with the momentum, which is applicable to both the photons of radiation and other material particles.
•    The wave nature of electron was experimentally by Davisson and Germer by studying the scattering of electrons.


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