how blackbody realized in practice
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A black body or blackbody is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence. ... It is an ideal emitter: at every frequency, it emits as much or more thermal radiative energy as any other body at the same temperature.
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Blackberry is a body that absorb all the radiation that falls on it and then release all the radiation slowly .
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