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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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May 26, 2024 · One of the prevailing theories about cathode rays was that they were a type of electromagnetic wave, similar to light. However, experiments by physicists like J.J. Thomson and Philipp Lenard suggested that cathode rays might actually be streams of charged particles. This controversy set the stage for Röntgen‘s groundbreaking work.
In 1898 he was appointed professor of experimental physics at Kiel. He returned to Heidelberg in 1907, where he remained until his retirement in 1931.Lenard's career falls naturally into two distinct periods. Before 1914 he made several major contributions to fundamental physics. In particular he investigated the photoelectric effect.
- 550,000 to 750,000 Years Ago: The Beginning of The Homo Sapiens Lineage
- 300,000 Years Ago: Fossils Found of Oldest Homo Sapiens
- 300,000 Years Ago: Artifacts Show A Revolution in Tools
- 100,000 to 210,000 Years Ago: Fossils Show Homo Sapiens Lived Outside of Africa
Genes, rather than fossils, can help us chart the migrations, movements and evolution of our own species—and those we descended from or interbred with over the ages. The oldest-recovered DNA of an early human relative comes from Sima de los Huesos, the “Pit of Bones.” At the bottom of a cave in Spain’s Atapuerca Mountains scientists found thousands...
As the physical remains of actual ancient people, fossils tell us most about what they were like in life. But bones or teeth are still subject to a significant amount of interpretation. While human remains can survive after hundreds of thousands of years, scientists can’t always make sense of the wide range of morphological features they see to def...
Our ancestors used stone tools as long as 3.3 million years ago and by 1.75 million years ago they’d adopted the Acheulean culture, a suite of chunky handaxes and other cutting implements that remained in vogue for nearly 1.5 million years. As recently as 400,000 years ago, thrusting spearsused during the hunt of large prey in what is now Germany w...
Many genetic analyses tracing our roots back to Africa make it clear that Homo sapiensoriginated on that continent. But it appears that we had a tendency to wander from a much earlier era than scientists had previously suspected. A jawbone found inside a collapsed caveon the slopes of Mount Carmel, Israel, reveals that modern humans dwelt there, al...
- Brian Handwerk
Starting in 1902, Lenard conducted important experiments on the photoelectric effect and his contribution has been summarized by Wheaton in the following terms: He [Lenard] uncovered the surprising fact that the maximum velocity with which electrons are ejected by ultraviolet light is entirely independent of the intensity of light.
Jan 28, 2014 · H. Hertz (1892) discovered that flakes of metal are transparent to cathode rays. After his untimely death his assistant Lenard followed the discovery up and constructed the tube which has been called after him. It was not an easy matter to cement on the tube an aluminium window which had to be very thin to let cathode rays pass, thick enough ...
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