What are black bodies are radiators of heat
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A black body is a theoretical/model body which absorbs all radiation falling on it, reflecting or transmitting none. For a black body there is no reflected radiation, and so the spectral radiance is entirely due to emission. In addition, a black body is a diffuse emitter (its emission is independent of direction).
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A blackbody refers to an opaque object that emits thermal radiation. A perfect blackbody is one that absorbs all incoming light and does not reflect any. At room temperature, such an object would appear to be perfectly black (hence the term blackbody).
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