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physics
Edward Condon – Pioneer in Quantum Mechanics – SciHi Blog

Edward Condon – Pioneer in Quantum Mechanics – SciHi Blog

Tabea Tietz
On March 2, 1902, American nuclear physicist Edward Uhler Condon was born. Condon was a pioneer in quantum mechanics and a participant in the development of radar and nuclear weapons during World War II as part of the Manhattan Project. The Franck–Condon principle and the Slater–Condon rules are co-named after him. “I have lost a good deal of sleep trying to figure out how you could have talked this way about a…
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physics
Wilhelm Wien and the Distribution Law for Blackbody Radiation

Wilhelm Wien and the Distribution Law for Blackbody Radiation

Harald Sack
On January 13, 1864, German physicist Wilhelm „Willy“ Carl Werner Otto Fritz Franz Wien, known as Wilhelm Wien, was born. He primarily researched the laws of thermal radiation and was awarded the Nobel Prize in Physics in 1911 for his work. Wilhelm Wien – Early Years Wien was born at Gaffken near Fischhausen, Province of Prussia (now Primorsk, Russia) as the son of landowner Carl Wien. In 1866, the Wien family, including Wilhelm,…
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biology
Alec Jeffreys and the Genetic Fingerprint

Alec Jeffreys and the Genetic Fingerprint

Tabea Tietz
On January 9, 1950, British geneticist Alec Jeffreys was born. In 1984, Jeffreys developed techniques for DNA fingerprinting and DNA profiling which are now used worldwide in forensic science to assist police detective work and to resolve paternity and immigration disputes. Alec Jeffries – Youth and Education Alec John Jeffreys was born into a middle-class family in Oxford, UK, where he spent the first six years of his life until 1956, when the family moved to Luton,…
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physics
Robert Millikan and the Millikan experiment

Robert Millikan and the Millikan experiment

Harald Sack
On December 19, 1953, US-American physicist and Nobel laureate Robert Andrews Millikan passed away. Millikan was honored with the Nobel Prize for Physics in 1923 for his measurement of the elementary electronic charge and for his work on the photoelectric effect. Millikan‘s famous oil-drop experiment (1911) was far superior to previous determinations of the charge of an electron, and further showed that the electron was a fundamental, discrete particle. In later work,…
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physics
Max Born and the statistical interpretation of the Wave Function

Max Born and the statistical interpretation of the Wave Function

Harald Sack
On December 11, 1882, German physicist, mathematician, and Nobel Laureate Max Born was born, who was instrumental in the development of quantum mechanics. He also made contributions to solid-state physics and optics and supervised the work of a number of notable physicists in the 1920s and 1930s. “Can we call something with which the concepts of position and motion cannot be associated in the usual way, a thing, or a particle? And if…
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physics
George Uhlenbeck and the Electron Spin

George Uhlenbeck and the Electron Spin

Harald Sack
On December 6, 1900, Dutch-American theoretical physicist George Eugene Uhlenbeck was born. Together with with Samuel A. Goudsmit, Uhlenbeck proposed the concept of electron spin (Jan 1925) – a fourth quantum number which was a half integer. Early Life George Uhlenbeck was the son of Eugenius Uhlenbeck, who served in the Dutch East Indian Army, and Anne Beeger Uhlenbeck, the daughter of a Dutch major general. He attended the Hogere Burgerschool (High…
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physics
Jean Baptiste Perrin and the Brownian Motion

Jean Baptiste Perrin and the Brownian Motion

Tabea Tietz
On September 30, 1870, French physicist Jean Baptiste Perrin was born. In his studies of the Brownian motion of minute particles suspended in liquids, Perrin verified Albert Einstein’s explanation of this phenomenon and thereby confirmed the atomic nature of matter. Jean Baptiste Perrin – Biographical Background Jean Baptiste Perrin was born in Lille, France, while his father, Captain Jean Baptiste Perrin, wounded at the battle of Saint-Privat, was locked up in Metz…
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astronomy
The first Observation of Gravitational Waves

The first Observation of Gravitational Waves

Tabea Tietz
On September 14, 2015, the LIGO Scientific Collaboration observed gravitational waves from a 410 megaparsec (1.3 billion light years) distant merger of two black holes. Previously, gravitational waves had only been inferred only indirectly, via their effect on the timing of pulsars in binary star systems. It was also the first observation of a binary black hole merger, demonstrating both the existence of binary stellar-mass black hole systens, and the fact that…
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physics
Arthur Holly Compton and the Compton Effect

Arthur Holly Compton and the Compton Effect

Harald Sack
On September 10, 1890, American physicist and Nobel Laureate Arthur Holly Compton was born. Compton won the Nobel Prize in Physics in 1927 for his discovery of the Compton effect, which demonstrated the particle nature of electromagnetic radiation. It was a sensational discovery at the time: the wave nature of light had been well-demonstrated, but the idea that light had both wave and particle properties was not easily accepted. Arthur Holly Compton…
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physics
Louis Essen and the Precise Measurement of Time

Louis Essen and the Precise Measurement of Time

Harald Sack
On August 24, 1997, English physicist Louis Essen FRS, O.B.E passed away. Essen’s most notable achievements were in the precise measurement of time and the determination of the speed of light. He invented the quartz crystal ring clock and the first practical atomic clock. These devices were capable of measuring time more accurately than any previous clocks. He built a cesium-beam atomic clock, a device that ultimately changed the way time is measured.…
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