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- Black_body abstract "A black body is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence.A black body in thermal equilibrium (that is, at a constant temperature) emits electromagnetic radiation called black-body radiation. The radiation is emitted according to Planck's law, meaning that it has a spectrum that is determined by the temperature alone (see figure at right), not by the body's shape or composition.A black body in thermal equilibrium has two notable properties:It is an ideal emitter: it emits as much or more energy at every frequency than any other body at the same temperature.It is a diffuse emitter: the energy is radiated isotropically, independent of direction.An approximate realization of a black surface is a hole in the wall of a large enclosure (see below). Any light entering the hole is reflected indefinitely or absorbed inside and is unlikely to re-emerge, making the hole a nearly perfect absorber. The radiation confined in such an enclosure may or may not be in thermal equilibrium, depending upon the nature of the walls and the other contents of the enclosure.Real materials emit energy at a fraction—called the emissivity—of black-body energy levels. By definition, a black body in thermal equilibrium has an emissivity of ε = 1.0. A source with lower emissivity independent of frequency often is referred to as a gray body.Construction of black bodies with emissivity as close to one as possible remains a topic of current interest. A white body is one with a "rough surface [that] reflects all incident rays completely and uniformly in all directions."In astronomy, the radiation from stars and planets is sometimes characterized in terms of an effective temperature, the temperature of a black body that would emit the same total flux of electromagnetic energy.".
- Black_body thumbnail Black_body.svg?width=300.
- Black_body wikiPageExternalLink books?id=LtdEjNABMlsC&printsec=frontcover.
- Black_body wikiPageExternalLink books?id=RVYEAAAAYAAJ&pg=PA1&lpg=PA1.
- Black_body wikiPageExternalLink theheatradiation00planrich.pdf.
- Black_body wikiPageExternalLink new-nano.html.
- Black_body wikiPageID "44364".
- Black_body wikiPageRevisionID "605602595".
- Black_body hasPhotoCollection Black_body.
- Black_body subject Category:Astrophysics.
- Black_body subject Category:Electromagnetic_radiation.
- Black_body subject Category:Heat_transfer.
- Black_body subject Category:Infrared.
- Black_body comment "A black body is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence.A black body in thermal equilibrium (that is, at a constant temperature) emits electromagnetic radiation called black-body radiation.".
- Black_body label "Black body".
- Black_body label "Ciało doskonale czarne".
- Black_body label "Corpo negro".
- Black_body label "Corpo nero".
- Black_body label "Corps noir".
- Black_body label "Cuerpo negro".
- Black_body label "Schwarzer Körper".
- Black_body label "Zwarte straler".
- Black_body label "Абсолютно чёрное тело".
- Black_body label "جسم أسود".
- Black_body label "黑体 (物理学)".
- Black_body label "黒体".
- Black_body sameAs Absolutně_černé_těleso.
- Black_body sameAs Schwarzer_Körper.
- Black_body sameAs Μέλαν_σώμα.
- Black_body sameAs Cuerpo_negro.
- Black_body sameAs Gorputz_beltz.
- Black_body sameAs Corps_noir.
- Black_body sameAs Benda_hitam.
- Black_body sameAs Corpo_nero.
- Black_body sameAs 黒体.
- Black_body sameAs 흑체.
- Black_body sameAs Zwarte_straler.
- Black_body sameAs Ciało_doskonale_czarne.
- Black_body sameAs Corpo_negro.
- Black_body sameAs m.0c2vy.
- Black_body sameAs Q161424.
- Black_body sameAs Q161424.
- Black_body wasDerivedFrom Black_body?oldid=605602595.
- Black_body depiction Black_body.svg.
- Black_body isPrimaryTopicOf Black_body.
