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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.
Starting in 1902, Lenard conducted important experiments on the photoelectric effect and his contribution has been summarized by Wheaton in the following terms: He [Lenard] uncovered the surprising fact that the maximum velocity with which electrons are ejected by ultraviolet light is entirely independent of the intensity of light.
- Mansoor Niaz, Stephen Klassen, Barbara McMillan, Don Metz
- 2010
During the years 1886–1902, Wilhelm Hallwachs and Philipp Lenard investigated the phenomenon of photoelectric emission in detail. Lenard observed that a current flows through an evacuated glass tube enclosing two electrodes when ultraviolet radiation falls on one of them.
21. März 2024 · In similar experiments in 1899 he proved that cathode rays are created when light strikes metal surfaces; this phenomenon later became known as the photoelectric effect. Lenard’s extensive research also included studies of ultraviolet light, the electrical conductivity of flames, and phosphorescence.
- The Editors of Encyclopaedia Britannica
photoelectric effect. For another decade, the light quantum was con sidered an unwarranted rejection of the thoroughly verified classical wave theory of light. This paper describes the context, substance, and influence of Lenard's investigation of the photoelectric effect. It presents the
ABSTRACT: The photoelectric effect is an important part of general physics textbooks. To study the presentation of this phenomenon, we have reconstructed six essential, history and philosophy of science (HPS)-related aspects of the events that culminated in Einstein
6. Mai 2011 · One manual referred to Lenard’s contribution in the following terms: “In 1902, Philipp von Lenard made the observations of the photoelectric effect that challenged the conventional wisdom of the day, and prompted Einstein’s famous explanation of the effect” (Dalhousie University 2009, p. 1).
