what is the definition of black body
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A blackbody (sometimes spelled "black body") is a theoretically ideal radiator and absorber of energy at all electromagnetic wavelength s. The term comes from the fact that a cold blackbody appears visually black. The energy emitted by a blackbody is called blackbody radiation.
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A black body is a metal sphere coated with platinum - black and a hole on its surface.
A perfect black - body emits and absorbs all radiations .
However a perfect black - body does not exist .
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