The Incredible Physics Behind Modern RADAR Technology @physicspartner

Uploaded July 2025 | Updated September 2026, 2 weeks ago

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The Incredible Physics Behind Modern RADAR Technology

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$Davisson and Germer Experiment – Wave Nature of Electron Please don’t hesitate to send me an email for any comments, suggestions, advice, query/question, need physics support and even online classes. My email address is thephysicspartner@gmail.com Introduction The Davisson-Germer experiment was an experiment designed to measure the thermal conductivity of a metal and is considered one of the most famous experiments in physics. The experiment was conducted by Robert A. Millikan and Harvey Fletcher in 1927 at the California Institute of Technology. It is often cited as an example of how particle physics can be used to test hypotheses about macroscopic objects with relative ease. The experiment consisted of a thin, flat metal disk that was immersed in a glass tube filled with oil, surrounded by water on all sides except for one side where the oil meets air. The disk had two electrodes attached to it that were connected to a high voltage power supply, which created an electric field across the gap between them and caused a constant current to flow through both electrodes into the surrounding water. The Davisson–Germer experiment was conducted by Clinton Davisson and Lester Germer at Western Electric (later Bell Labs) between 1923 and 1927 in which electrons scattered by the surface of a nickel metal crystal displayed a diffraction pattern. This experiment confirmed Louis de Broglie’s hypothesis of wave-particle duality, which he proposed in 1924, and was a watershed moment in the development of quantum mechanics Walter M. Elsasser in Göttingen in the 1920s made an important contribution to the Davisson–Germer experiment by remarking that the wave-like nature of matter could be investigated by electron scattering experiments on crystalline solids, just as the wave-like nature of X-rays had been confirmed by X-ray scattering experiments on crystalline solids. Elsasser’s suggestion was then relayed to physicists in England by his senior colleague (and later Nobel Prize winner) Max Born. When the Davisson and Germer experiment was carried out, the results were explained by Elsasser’s proposition. The Davisson and Germer experiment, on the other hand, was designed to study the surface of nickel rather than to confirm the de Broglie hypothesis. Davisson and Germer experiment A vacuum chamber is used for the Davisson and Germer experiment. As a result, the medium’s electron deflection and scattering are avoided. The following are the main components of the experimental setup: • A low voltage power supply was used to heat an electron gun with a tungsten filament F coated with barium oxide. • When a suitable potential difference is applied from a high voltage power supply, the electron gun emits electrons that are then accelerated to a specific velocity. • The released electrons were directed toward the surface of a nickel crystal by passing through a cylinder perforated with small holes along its axis, resulting in a fine collimated beam. As a result, electrons scatter in various directions. • The intensity of the electron beam produced is measured by the electron detector, and it is then moved on a circular scale after being connected to a sensitive galvanometer (to record the current). • The intensity of the scattered electron beam is measured for different values of angle of scattering by moving the detector on the circular scale at different positions that change the (angle between the incident and scattered electron beams). Davisson and germer experiment proved • An electron cannon was heated with a tungsten filament F coated with barium oxide using a low voltage power supply. • When an appropriate potential difference from a high voltage power source is applied, the electron cannon produces electrons that are then accelerated to a specific velocity. • These liberated electrons were forced to pass through a cylinder perforated with small holes along its axis, resulting in a finely collimated beam. • The beam from the cylinder is directed once more toward the surface of a nickel crystal. As a result, electrons disperse in a variety of ways. • The electron detector records the intensity of the generated electron beam, which is then moved on a circular scale after being linked to a sensitive galvanometer (to record the current). • The intensity of the scattered electron beam is measured at various angles of scattering by moving the detector on a circular scale at various locations that modify the (angle between the incident and scattered electron beams)$

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