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Philipp von Lenard was born at Pozsony 1 (Pressburg) in Austria-Hungary on June 7, 1862. His family had originally come from the Tyrol. He studied physics successively at Budapest, Vienna, Berlin and Heidelberg under Bunsen, Helmholtz, Königsberger and Quincke and in 1886 took his Ph.D. at Heidelberg. From 1892 he worked as a Privatdozent and ...
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Nominations - Philipp Lenard – Biographical - NobelPrize.org
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Nobel Lecture - Philipp Lenard – Biographical -...
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Facts - Philipp Lenard – Biographical - NobelPrize.org
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Jean Perrin - Philipp Lenard – Biographical - NobelPrize.org
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May 26, 2024 · The discovery of X-rays by Wilhelm Röntgen in 1895 was a turning point in the history of medicine and science. What began as a chance observation in a laboratory quickly became one of the most important medical tools of the modern era, transforming the way we diagnose and treat disease. Today, more than a century after Röntgen‘s discovery ...
- 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...
- Kathy Joseph
Lenard, Nobel lecture, 19051. 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.
May 1, 2023 · Most of them, for their part, did not claim any priority, some did so rather casually. 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.
Despite not approaching the photoelectric effect in an overall satisfactory manner from the point of view of our six criteria, some textbooks did offer good incidental insights. Several pointed out that “[h]ow the photoelectric effect was discovered was an irony of history” (Weidner & Browne, 1985, p. 867).
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