In the year , two American physicists C.J Davisson and L.H Germer conducted an experiment to explain the wave nature of electrons. Description: Davisson and Germer’s experiment was in the support of de Broglie’s hypothesis. They demonstrated the diffraction of electron beam similar to. Davisson Germer experiment with observations, Co-relating Davisson Germer experiment and de Broglie are provided here. Learn more about it at BYJU’S.

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Classical daviskn Old quantum theory Bra—ket notation Hamiltonian Interference. Derivation Of Kinetic Energy Class 9. The angles of maximum reflection are given by Bragg’s condition for constructive interference from an array, Bragg’s law. As Davisson and Germer state in their follow-up paper, “These results, including the failure of the data to satisfy the Bragg formula, are in accord with those previously obtained in our experiments on electron diffraction.

Those peaks satisfy a sequence 2,3,4, suggesting that the first gerer of that series would have been at 5.

Davisson–Germer experiment

By varying the applied voltage to the electron gun, the maximum intensity of electrons diffracted by the atomic surface was found at different angles. Questions still needed to be answered and experimentation continued through I don’t know if that makes sense. You have selected the wrong answer!!

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They demonstrated the diffraction of electron beam similar to diffraction of light waves. Davisson-Germer Experiment Davisson, C. This confirmed the hypothesisadvanced by Louis de Broglie inof wave-particle duality, and was an experimental milestone in the creation of quantum mechanics.

On a break, Davisson attended the Oxford meeting of the British Association for the Advancement of Science in summer By using this site, you agree to the Terms of Use and Privacy Policy.

Which of the following shown particle nature of light. This, ingenerated a diffraction pattern with unexpected peaks. The experiment consisted of firing an electron beam from an electron gunan electrostatic particle accelerator at a nickel crystal, perpendicular to the surface of the crystal, and measuring how the number of reflected electrons varied as the angle between the detector and the nickel surface varied. Practise s of questions mapped to your syllabus. To remove the oxide, Davisson and Germer heated the specimen in a high temperature oven, not knowing that this caused the formerly polycrystalline structure of the nickel to form large single crystal areas with crystal planes continuous over the width of the electron beam.

However the initial intention of the Davisson and Germer experiment was not to confirm the de Broglie hypothesisbut rather to study the surface of nickel.

A series of experiments continued through The detector was designed to accept only elastically scattered electrons.

Davisson Germer Experiment and De Broglie’S Relation | Physics

Congratulations You have selected the correct answer!! This graph shows that electron beam creates diffraction pattern which is a property of wave, so it is confirmed that electron beam has the wave nature.

Thus, Davisson Germer experiment confirms the wave nature of electrons and the de Broglie relation. Putting wave-particle duality on a firm experimental footing, it represented a major step forward in the development davizon quantum mechanics.


As Max gerrmer Laue proved inthe periodic crystal structure serves as a type of three-dimensional diffraction grating. Practise This Question Which of the following shown particle nature of light.

Dymond, and Blackett, James Chadwick, and Charles Ellis — had attempted similar diffraction experiments, but were unable to generate low enough vacuums or detect the low-intensity beams needed.

It was a great surprise to them to find that at certain angles there was a peak in the intensity of the scattered electron beam. Davisson and Germer designed and built a vacuum apparatus for the purpose of measuring the energies of electrons scattered from a metal surface. Initial atomic models proposed by scientists could only explain the particle nature of electrons but failed to explain the properties related to their wave nature.

Davisson Germer Experiment – Electron Diffraction

Davisson and Germer’s accidental discovery of the expwriment of electrons was the first direct evidence confirming de Broglie’s hypothesis that particles can have wave properties as well. To measure the number of electrons that were scattered at different angles, a faraday cup electron detector that could be moved on an arc path about the crystal was used.

Difference Between Reflection And Refraction.