Describe the Davisson and Germer experiment.
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=) In 1927 , Davisson and Germer did an experiment and demonstrated that a beam of electrons does suffer diffraction . Their apparatus in shown in figure . Electrons emitted from a heated filament F in an electron-gun are collimated into a fine pencil by perforated diaphragms and are accelerated through a variable potential V . The electron-beam emerging from the gun falls normally on a nickel crystal C . The electrons are diffracted from the crystal in all directions . The intensity of the diffracted beam in different directions is measured by a Faraday cylinder connected to a galvanometer , which can be moved along a circular scale S . The crystal C can be turned about an axis parallel to the incident beam . Thus , any azimuth of the crystal can be presented to the plane defined by the incident beam and the beam entering the Faraday cylinder .
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_________________________
_________________________
Here's , Your Answer ...
=) In 1927 , Davisson and Germer did an experiment and demonstrated that a beam of electrons does suffer diffraction . Their apparatus in shown in figure . Electrons emitted from a heated filament F in an electron-gun are collimated into a fine pencil by perforated diaphragms and are accelerated through a variable potential V . The electron-beam emerging from the gun falls normally on a nickel crystal C . The electrons are diffracted from the crystal in all directions . The intensity of the diffracted beam in different directions is measured by a Faraday cylinder connected to a galvanometer , which can be moved along a circular scale S . The crystal C can be turned about an axis parallel to the incident beam . Thus , any azimuth of the crystal can be presented to the plane defined by the incident beam and the beam entering the Faraday cylinder .
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