Blackbody Temperature
The
temperature of an object if it is re-radiating all the thermal energy that has
been added to it; if an object is not a blackbody radiator, it will not
re-radiate all the excess heat and the leftover will go toward increasing its
temperature.
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:
1.
It is an ideal emitter: it emits as much or more energy at every
frequency than any other body at the same temperature.
2.
It is a diffuse emitter: the energy is radiated isotropically,
independent of direction.
Source: wikipedia, NASA
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