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Gustav Kirchhoff



Gustav Robert Kirchhoff

Gustav Kirchhoff
Born12 March 1824(1824-03-12)
Königsberg, East Prussia
Died17 October 1887 (aged 63)
Berlin, Germany
ResidenceGermany
NationalityGerman
FieldPhysicist
InstitutionsUniversity of Berlin
University of Breslau
University of Heidelberg
Alma materUniversity of Königsberg
Academic advisor  Franz Ernst Neumann
Notable students  Max Noether
Ernst Schröder
Known forKirchhoff's circuit laws
Kirchhoff's law of thermal radiation
Notable prizesRumford medal


Gustav Robert Kirchhoff (March 12, 1824 – October 17, 1887) was a German physicist who contributed to the fundamental understanding of electrical circuits, spectroscopy, and the emission of black-body radiation by heated objects. He coined the term "black body" radiation in 1862, and two sets of independent concepts in both circuit theory and thermal emission are named "Kirchhoff's laws" after him.

Additional recommended knowledge

Life and work

Gustav Kirchhoff was born in Königsberg, East Prussia, the son of Friedrich Kirchhoff, a lawyer, and Johanna Henriette Wittke. He graduated from the Albertus University of Königsberg in 1847 where he attended the mathematico-physical seminar directed by Franz Ernst Neumann and Friedrich Julius Richelot. He married Clara Richelot, the daughter of his mathematics professor Richelot. In the same year, they moved to Berlin, where he stayed until he received a professorship at Breslau.

Kirchhoff formulated his circuit laws, which are now ubiquitous in electrical engineering, in 1845, while still a student. He completed this study as a seminar exercise; it later became his doctoral dissertation. He proposed his law of thermal radiation in 1859, and gave a proof in 1861. He was called to the University of Heidelberg in 1854, where he collaborated in spectroscopic work with Robert Bunsen. Together Kirchhoff and Bunsen discovered caesium and rubidium in 1861 while studying the chemical composition of the Sun via its spectral signature. At Heidelberg he ran a mathematico-physical seminar, modelled on Neumann's, with the mathematician Leo Koenigsberger. Among those who attended this seminar were Arthur Schuster and Sofia Kovalevskaya. In 1875 Kirchhoff accepted the first chair specifically dedicated to theoretical physics at Berlin.

In 1862 he was awarded the Rumford Medal for his researches on the fixed lines of the solar spectrum, and on the inversion of the bright lines in the spectra of artificial light.

He contributed greatly to the field of spectroscopy by formalizing three laws that describe the spectral composition of light emitted by incandescent objects, building substantially on the discoveries of David Alter and Anders Jonas Angstrom (see also: spectrum analysis)

Kirchhoff's Three Laws of Spectroscopy:

  1. A hot solid object produces light with a continuous spectrum.
  2. A hot tenuous gas produces light with spectral lines at discrete wavelengths (i.e. specific colors) which depend on the energy levels of the atoms in the gas. (See also: emission spectrum)
  3. A hot solid object surrounded by a cool tenuous gas (i.e. cooler than the hot object) produces light with an almost continuous spectrum which has gaps at discrete wavelengths depending on the energy levels of the atoms in the gas. (See also: absorption spectrum)

The existence of discrete spectral lines was later explained by the Bohr model of the atom, which helped lead to quantum mechanics.

Kirchhoff died in 1887, and was buried in the St Matthäus Kirchhof Cemetery in Schöneberg, Berlin, only a few meters from the graves of the Brothers Grimm.

See also

 

References

 

  • O'Connor, John J; Edmund F. Robertson "Gustav Kirchhoff". MacTutor History of Mathematics archive.  
  • Eric W. Weisstein, Kirchhof, Gustav (1824-1887) at ScienceWorld.


Persondata
NAME Kirchhof, Gustav Robert
ALTERNATIVE NAMES Kirchhoff
SHORT DESCRIPTION Physicist
DATE OF BIRTH 12 March 1824(1824-03-12)
PLACE OF BIRTH Königsberg, East Prussia
DATE OF DEATH 17 October 1887
PLACE OF DEATH Berlin, Germany
 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Gustav_Kirchhoff". A list of authors is available in Wikipedia.
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