Photoelectric effect: Difference between revisions
From Glossary of Meteorology
(Created page with " {{TermHeader}} {{TermSearch}} <div class="termentry"> <div class="term"> == photoelectric effect == </div> <div class="definition"><div class="short_definition">Any pr...") |
m (Rewrite with Template:Term and clean up) |
||
| (One intermediate revision by the same user not shown) | |||
| Line 1: | Line 1: | ||
{{Term | |||
|Display title=photoelectric effect | |||
{{ | |Definitions={{Definition | ||
|Num=1 | |||
|Meaning=Any process in which [[illumination]] of a material by [[electromagnetic radiation]] causes [[electrons]] to be separated from atoms or molecules. | |||
|Explanation=Photoelectric effect is often synonymous with surface photoelectric effect, "the release of electrons by [[light]] at the boundary between a solid or liquid . . . and usually a gas" (Hughes and Dubridge 1932). The photoelectric effect was discovered in 1887 by Heinrich Hertz. The fundamental law of photoelectricity is the Einstein law <blockquote>[[File:ams2001glos-Pe13.gif|link=|center|ams2001glos-Pe13]]</blockquote> where ''e'' is the (maximum) [[kinetic energy]] of the emitted [[photoelectron]], ν is the [[frequency]] of the source of illumination, ''h'' is [[Planck's constant]], and ''p'' is the (minimum) difference between the [[potential energy]] of an electron inside and outside the material to which it is bound. An implicit assumption underlying this equation is that the initial kinetic energy of the electron is negligible compared with its maximum kinetic energy. The Einstein law played a fundamental role in establishing the [[quantum theory]] of light (Leighton 1959).<br/> Hughes, A. L., and L. A. DuBridge 1932. Photoelectric Phenomena. 1–2. <br/> Leighton, R. B. 1959. Principles of Modern Physics. 67–69. | |||
}} | |||
= | }} | ||
Latest revision as of 03:07, 29 March 2024
Any process in which illumination of a material by electromagnetic radiation causes electrons to be separated from atoms or molecules.
Photoelectric effect is often synonymous with surface photoelectric effect, "the release of electrons by light at the boundary between a solid or liquid . . . and usually a gas" (Hughes and Dubridge 1932). The photoelectric effect was discovered in 1887 by Heinrich Hertz. The fundamental law of photoelectricity is the Einstein law
Hughes, A. L., and L. A. DuBridge 1932. Photoelectric Phenomena. 1–2.
Leighton, R. B. 1959. Principles of Modern Physics. 67–69.
where e is the (maximum) kinetic energy of the emitted photoelectron, ν is the frequency of the source of illumination, h is Planck's constant, and p is the (minimum) difference between the potential energy of an electron inside and outside the material to which it is bound. An implicit assumption underlying this equation is that the initial kinetic energy of the electron is negligible compared with its maximum kinetic energy. The Einstein law played a fundamental role in establishing the quantum theory of light (Leighton 1959).
Hughes, A. L., and L. A. DuBridge 1932. Photoelectric Phenomena. 1–2.
Leighton, R. B. 1959. Principles of Modern Physics. 67–69.
