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It is clear from the historical record that theories of the photoelectric effect, beginning with Lenard's triggering hypothesis, existed before Einstein proposed his light quantum. Among the most prominent physicists not to accept Einstein's theory for some time were Max Planck and Robert Millikan. Millikan, although he was able to demonstrate ...
- Mansoor Niaz, Stephen Klassen, Barbara McMillan, Don Metz
- 2010
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.
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.
16. Mai 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
A historical analysis of Lenard's discovery and interpretation of the photoelectric effect, and its impact on atomic theory and quantum mechanics. The paper examines Lenard's experimental and theoretical contributions, his views on cathode rays and ether, and his role in the light quantum controversy.
12. Apr. 2024 · photoelectric effect, phenomenon in which electrically charged particles are released from or within a material when it absorbs electromagnetic radiation. The effect is often defined as the ejection of electrons from a metal plate when light falls on it.
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
