Davisson Germer Experiment and De Broglie'S Relation - GMS - Learning Simply
Students' favourite free learning app with LIVE online classes, instant doubt resolution, unlimited practice for classes 6-12, personalized study app for Maths, Science, Social Studies, video e-learning, online tutorial, and more. Join Telegram

Davisson Germer Experiment and De Broglie'S Relation

Please wait 0 seconds...
Scroll Down and click on Go to Link for destination
Congrats! Link is Generated

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. C.J. Davisson and L.H. Germer, in the year 1927, carried out an experiment, popularly known as Davisson Germer’s experiment, to explain the wave nature of electrons through electron diffraction. In this article, we will learn about the observations and conclusions of the experiment.

Setup of Davisson Germer Experiment

Davisson Germer experiment model

Davisson Germer experiment

The experimental arrangement of the Davisson Germer experiment is discussed below:

  • An electron gun comprising a tungsten filament F was coated with barium oxide and heated through a low voltage power supply.
  • While applying suitable potential difference from a high voltage power supply, the electron gun emits electrons which were again accelerated to a particular velocity.
  • In a cylinder perforated with fine holes along its axis, these emitted electrons were made to pass through it, thus producing a fine collimated beam.
  • The beam produced from the cylinder is again made to fall on the surface of a nickel crystal. Due to this, the electrons scatter in various directions.
  • The beam of electrons produced has a certain amount of intensity which is measured by the electron detector and after it is connected to a sensitive galvanometer (to record the current), it is then moved on a circular scale.
  • By moving the detector on the circular scale at different positions that is changing the θ (angle between the incident and the scattered electron beams), the intensity of the scattered electron beam is measured for different values of angle of scattering.

Read More: Wave Nature of Matter

Observations of Davisson Germer experiment:

From this experiment, we can derive the below observations:

Related Posts
  • We obtained the variation of the intensity (I) of the scattered electrons by changing the angle of scattering, θ.
  • By changing the accelerating potential difference, the accelerated voltage was varied from 44V to 68 V.
  • With the intensity (I) of the scattered electron for an accelerating voltage of 54V at a scattering angle θ = 50º, we could see a strong peak in the intensity.
  • This peak was the result of constructive interference of the electrons scattered from different layers of the regularly spaced atoms of the crystals.
  • With the help of electron diffraction, the wavelength of matter waves was calculated to be 0.165 nm.

Co-relating Davisson Germer Experiment and de Broglie Relation:

According to de Broglie,

λ = h /p

λ=(1.22754)=0.167nm

λ = wavelength associated with electrons

Thus, Davisson Germer experiment confirms the wave nature of electrons and the de Broglie relation.

To learn more about Davisson Germer experiment, and other related topics like a magnetic field, electric current, etc. download GMS - Learning Simply App.

About the Author

At the helm of GMS Learning is Principal Balkishan Agrawal, a dedicated and experienced educationist. Under his able guidance, our school has flourished academically and has achieved remarkable milestones in various fields. Principal Agrawal’s visio…

Post a Comment

Cookie Consent
We serve cookies on this site to analyze traffic, remember your preferences, and optimize your experience.
Oops!
It seems there is something wrong with your internet connection. Please connect to the internet and start browsing again.
AdBlock Detected!
We have detected that you are using adblocking plugin in your browser.
The revenue we earn by the advertisements is used to manage this website, we request you to whitelist our website in your adblocking plugin.
Site is Blocked
Sorry! This site is not available in your country.