Concept information
Terme préférentiel
blackbody
Définition(s)
- A theoretical object that is simultaneously a perfect absorber (it does not reflect any radiation) and a perfect emitter of radiation in allwavelengths and whose radiation is governed solely by its temperature. Blackbody radiation cannot be explained by classical physics. The study of its characteristics has, therefore, played an important role in the development of quantum mechanics. A blackbody can be realized in the form of a cavity with highly absorbing internal walls and a small aperture. Any ray entering through the aperture can leave the cavity only after repeated reflection from the walls. When the aperture is sufficiently small, therefore, the cavity will absorb practically all the radiation incident on the aperture, and so the surface of the aperture will be a black body. The light within the cavity will always interact and exchange energy with the material particles of the walls and any other material particles present. This interaction will eventuall thermalize the radiation within the cavity, producing a blackbody spectrum, represented by a blackbody curve. (An Etymological Dictionary of Astronomy and Astrophysics, by M. Heydari-Malayeri, https://dictionary.obspm.fr/index.php?formSearchTextfield=blackbody&formSubmit=Search&showAll=1)
Concept(s) générique(s)
Synonyme(s)
- black body
Traductions
-
français
URI
http://data.loterre.fr/ark:/67375/MDL-F8LLTCWD-1
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