Black body or blackbody is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence.
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10 Facts About Black body
2.
Any light entering the hole is reflected or absorbed at the internal surfaces of the Black body and is unlikely to re-emerge, making the hole a nearly perfect absorber.
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3.
Idea of a black body originally was introduced by Gustav Kirchhoff in 1860 as follows:.
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4.
Transparent Black body is one that transmits all the radiation that reaches it.
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5.
Grey Black body is one where a, ? and t are constant for all wavelengths.
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6.
White Black body is one for which all incident radiation is reflected uniformly in all directions: t = 0, a = 0, and ? = 1.
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7.
Planck noted three requirements upon a black body: the body must allow radiation to enter but not reflect; possess a minimum thickness adequate to absorb the incident radiation and prevent its re-emission; satisfy severe limitations upon scattering to prevent radiation from entering and bouncing back out.
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8.
Black body hole is a region of spacetime from which nothing escapes.
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9.
Integration of Planck's law over all frequencies provides the total energy per unit of time per unit of surface area radiated by a black body maintained at a temperature T, and is known as the Stefan–Boltzmann law:.
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10.
The rate of decrease of the temperature of the emitting Black body can be estimated from the power radiated and the Black body's heat capacity.
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