Friedrich Hasenöhrl

Friedrich Hasenöhrl
Friedrich Hasenöhrl
Born	(1874-11-30)30 November 1874 Vienna, Austria-Hungary
Died	7 October 1915(1915-10-07) (aged 40) Vielgereuth, Welschtirol, Austria-Hungary
Residence	Austria-Hungary
Nationality	Austro-Hungarian
Fields	Physicist
Institutions	University of Vienna
Alma mater	University of Vienna
Doctoral advisor	Franz S. Exner
Doctoral students	Karl Herzfeld Erwin Schrödinger
Known for	Cavity radiation

Friedrich Hasenöhrl (German: [ˈhaːzn̩øːɐ̯l]; 30 November 1874 – 7 October 1915), was an Austrian physicist.

Friedrich Hasenöhrl was born in Vienna, Austria-Hungary in 1874. His father was a lawyer and his mother belonged to a prominent aristocratic family. After his elementary education, he studied natural science and mathematics at the University of Vienna under Joseph Stefan (1835–1893) and Ludwig Boltzmann (1844–1906). In 1896, he attained a doctorate under Franz-Serafin Exner with a thesis titled "Über den Temperaturkoeffizienten der Dielektrizitätskonstante in Flüssigkeiten und die Mosotti-Clausius'sche Formel".

He worked under Heike Kamerlingh Onnes in Leiden at the low temperature laboratory, and there he also was friendly connected with H. A. Lorentz.

In 1907 he became Boltzmann's successor at the University of Vienna as the head of the Department of Theoretical Physics. He had a number of illustrious pupils there and had an especially significant impact on Erwin Schrödinger, who later won the Nobel Prize for Physics for his contributions to quantum mechanics.

When the war broke out in 1914, he volunteered at once into the Austria-Hungarian army. He fought as Oberleutnant against the Italians in Tyrol. He was wounded, recovered and returned to the front. He was then killed by a grenade in an attack on Mount Plaut (Folgaria) on 7 October 1915 at the age of 40.

Since J. J. Thomson in 1881, many physicists like Wilhelm Wien (1900), Max Abraham (1902), and Hendrik Lorentz (1904) used equations equivalent to