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These facts conflicted with current theory and were not explained until 1905, when Einstein produced his quantitative law and developed the theory of quanta of light or photons, which was verified much later by Millikan. But Lenard never forgave Einstein for discovering and attaching his own name to this law.
- Nominations
The Nobel Prize in Physics 1905 Philipp Lenard. Nominated on...
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- Facts
Philipp Eduard Anton von Lenard The Nobel Prize in Physics...
- Jean Perrin
Eleven laureates were awarded a Nobel Prize in 2023, for...
- Nominations
- The Start of The Photoelectric Effect
- Hertz’s Death and The X-Ray
- Thomson’s Cathode Ray
- Lenard and Einstein
- Lenard Terrorizes Einstein
- References
Let’s start in around 1880 when Lenard first heard about something called cathode rays when he was a teenager in 1880 or so. Let’s start in a dark laboratory in Germany in May of 1887. That was where a 30-year-old scientist named Heinrich Hertz was experimenting with the large sparks from an induction coil. He had found that if he added an antenna ...
Hertz died mere weeks later and Lenard took time off of his research to edit German and English memorials of Hertz’s work and biography. This was an unfortunate timing for a distraction from work as just the next year another German scientist named Wilhelm Roentgen was experimenting with a “Lenard tube” with a heavier phosphorescent screen and disc...
However, in 1897, JJ Thomson discovered that the cathode ray wasn’t a type of light at all but was instead a beam of charged particles that we now call a beam of electrons. With the discovery of the electron, Lenard found that his research in the cathode ray was made moot. Moreover, if the cathode ray was a ray of particles and the x-ray was a ray ...
In December of 1900, a man named Max Planck published his equations for blackbody radiation where he assumed that light came in little energy elements with energy equal to a constant times the frequency of the light. This would explain why ultraviolet light would produce different effects than visible light as it has higher frequency and therefore ...
At around this time Einstein learned that his friend named Jakob Laub had got a job as an assistant to Lenard. Einstein wrote Laub, “I took great pleasure in this news… I think that the opportunity to work with Lenard is worth far more than the assistant ship and income combined… [Lenard] is a great master, an inventive thinker!” However, Laub’s re...
p 98 “Electric Universe” Hertz, H “On an effect of Ultra-violet light upon the electric discharge” Translated by Jones, D Electric Waves(1893) p. 63 Hertz, H “On an effect of Ultra-violet light upon the electric discharge” Translated by Jones, D Electric Waves(1893) p. 76 Hertz, H “On an effect of Ultra-violet light upon the electric discharge” Tra...
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Lenard also seems to have come close to making two other discoveries. He almost discovered x-rays and felt that if he had not moved to Aachen in 1895 he would have been successful. He did in fact help their discoverer Wilhelm Röntgen with equipment – aid which, he argued, was never duly acknowledged.
Lenard was the first to cause cathode rays to pass from the interior of a vacuum tube through a thin metal window into the air, where they produce luminosity. Lenard received the 1905 Nobel Prize in Physics for his research in this field.
May 1, 2023 · The German-Hungarian physicist Philipp Lenard, a co-founder of German Physics, considered himself a “true discoverer”. It remains to be said, however, that he, like many others before him, failed to recognize the character of the new radiation.
Philipp Lenard discovered in 1902 that the maximum velocity with which electrons leave a metal plate after it is illuminated with ultra. violet light is independent of the intensity of the light. He concluded that "in the process of emission the light plays only the role of trigger.
One of his most important contributions was the experimental realization of the photoelectric effect. He discovered that the energy (speed) of the electrons ejected from a cathode depends only on the wavelength, and not the intensity, of the incident light.
