Philipp Lenard

Philipp Lenard
Philipp Lenard in 1900
Born	Philipp Eduard Anton von Lenard (1862-06-07)7 June 1862 Pressburg, Kingdom of Hungary, Austrian Empire
Died	20 May 1947(1947-05-20) (aged 84) Messelhausen, Germany
Citizenship	Hungarian[1] (1862–1907) German (1907–1947)
Alma mater	University of Heidelberg
Known for	Cathode rays Photoelectric effect Grid control Lenard window
Spouse	Katharina Schlehner
Awards	Matteucci Medal (1896) Rumford Medal (1896) Nobel Prize for Physics (1905) Franklin Medal (1932)
Scientific career
Fields	Physics
Institutions	University of Budapest University of Breslau University of Aachen University of Heidelberg University of Kiel University of Berlin
Doctoral advisor	R. Bunsen G. H. Quincke
Doctoral students	Edward Andrade Walther Kossel

Philipp Eduard Anton von Lenard (German pronunciation: [ˈfɪlɪp ˈleːnaʁt] ^ⓘ; Hungarian: Lénárd Fülöp Eduárd Antal; 7 June 1862 – 20 May 1947) was a Hungarian-born German physicist and the winner of the Nobel Prize for Physics in 1905 for his work on cathode rays and the discovery of many of their properties. One of his most important contributions was the experimental realization of the photoelectric effect. He discovered that the energy (speed) of the electrons ejected from a cathode depends only on the frequency, and not the intensity, of the incident light.

Lenard was a nationalist and anti-Semite; as an active proponent of the Nazi ideology, he supported Adolf Hitler in the 1920s and was an important role model for the "Deutsche Physik" movement during the Nazi period. Notably, he labeled Albert Einstein's contributions to science as Jewish physics.