Biography:Wilhelm Wien

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Short description: German physicist
Wilhelm Wien
Wilhelm Wien 1911.jpg
Wien in 1911
Born
Wilhelm Carl Werner Otto Fritz Franz Wien

(1864-01-13)13 January 1864
Gaffken, Province of Prussia
Died30 August 1928(1928-08-30) (aged 64)
Munich, Germany
Alma materUniversity of Göttingen
University of Berlin
Known forBlackbody radiation
Wien filter
Wien's displacement law
Wien's distribution law
Spouse(s)Luise Mehler (1898) (1877-1961)
AwardsGuthrie Lecture (1925)
Nobel Prize for Physics (1911)
Scientific career
FieldsPhysics
InstitutionsUniversity of Giessen
University of Würzburg
University of Munich
RWTH Aachen
Doctoral advisorHermann von Helmholtz
Doctoral studentsGabriel Holtsmark
Eduard Rüchardt

Wilhelm Carl Werner Otto Fritz Franz Wien (German pronunciation: [ˈvɪlhɛlm ˈviːn] (About this soundlisten); 13 January 1864 – 30 August 1928) was a German physicist who, in 1893, used theories about heat and electromagnetism to deduce Wien's displacement law, which calculates the emission of a blackbody at any temperature from the emission at any one reference temperature.

He also formulated an expression for the black-body radiation, which is correct in the photon-gas limit. His arguments were based on the notion of adiabatic invariance, and were instrumental for the formulation of quantum mechanics. Wien received the 1911 Nobel Prize for his work on heat radiation.

He was a cousin of Max Wien, inventor of the Wien bridge.

Biography

Early years

Wien was born at Gaffken (now in Baltiysky District) near Fischhausen in the Province of Prussia as the son of landowner Carl Wien. In 1866, his family moved to Drachenstein near Rastenburg (now Kętrzyn, Poland).

In 1879, Wien went to school in Rastenburg and from 1880 to 1882 he attended the city school of Heidelberg. In 1882 he attended the University of Göttingen and the University of Berlin. From 1883 to 1885, he worked in the laboratory of Hermann von Helmholtz and, in 1886, he received his Ph.D. with a thesis on the diffraction of light upon metals and on the influence of various materials upon the color of refracted light. From 1896 to 1899, Wien lectured at RWTH Aachen University. He became twice successor of Wilhelm Conrad Röntgen, in 1900 at the University of Würzburg and in 1919 at the University of Munich. Wien was very active in science politics representing conservative and nationalistic positions though being not as extreme as sharing the attitude of those going to develop the "Deutsche Physik". He appreciated both Albert Einstein and relativity.[1]

Career

In 1896 Wien empirically determined a distribution law of blackbody radiation,[2] later named after him: Wien's law. Max Planck, who was a colleague of Wien's, did not believe in empirical laws, so using electromagnetism and thermodynamics, he proposed a theoretical basis for Wien's law, which became the Wien–Planck law. However, Wien's law was only valid at high frequencies, and underestimated the radiancy at low frequencies. Planck corrected the theory and proposed what is now called Planck's law, which led to the development of quantum theory. However, Wien's other empirical formulation [math]\displaystyle{ \lambda_{\mathrm{max}} T = \mathrm{constant} }[/math], called Wien's displacement law, is still very useful, as it relates the peak wavelength emitted by a body (λmax), to the temperature of the body (T). In 1900 (following the work of George Frederick Charles Searle), he assumed that the entire mass of matter is of electromagnetic origin and proposed the formula [math]\displaystyle{ m=(4/3)E/c^2 }[/math] for the relation between electromagnetic mass and electromagnetic energy.

Wien developed the Wien filter (also known as velocity selector) in 1898 for the study of anode rays. It is a device consisting of perpendicular electric and magnetic fields that can be used as a velocity filter for charged particles, for example in electron microscopes and spectrometers. It is used in accelerator mass spectrometry to select particles based on their speed. The device is composed of orthogonal electric and magnetic fields, such that particles with the correct speed will be unaffected while other particles will be deflected. It can be configured as a charged particle energy analyzer, monochromator, or mass spectrometer.

While studying streams of ionized gas, Wien, in 1898, identified a positive particle equal in mass to the hydrogen atom. Wien, with this work, laid the foundation of mass spectrometry. J. J. Thomson refined Wien's apparatus and conducted further experiments in 1913 then, after work by Ernest Rutherford in 1919, Wien's particle was accepted and named the proton.

In 1911, Wien was awarded the Nobel Prize in Physics "for his discoveries regarding the laws governing the radiation of heat".[3] He delivered the Ernest Kempton Adams Lecture at Columbia University in 1913.[4]

See also

Publications

References

  1. ↑ Wolff, Stefan L. (30 July 2017). "Physiker im "Krieg der Geister"". http://www.deutsches-museum.de/fileadmin/Content/010_DM/050_Forschung/020_Forschung_Mitarbeiter/Wolff_01.pdf. 
  2. ↑ Kragh, H. (2002). Quantum Generations: A History of Physics in the Twentieth Century. Princeton University Press. p. 58. ISBN 978-0-691-09552-3. https://books.google.com/books?id=ELrFDIldlawC&pg=PA58. 
  3. ↑ "The Nobel Prize in Physics 1911". The Nobel Foundation. https://www.nobelprize.org/nobel_prizes/physics/laureates/1911/. 
  4. ↑ "EKA Lecture Series Returns, Bringing International Quantum Science to Columbia for More Than a Century | Department of Physics" (in en). https://www.physics.columbia.edu/news/eka-lecture-series-returns-bringing-international-quantum-science-columbia-more-century. 

External links



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