How can a perfectly black body realized in practice??Do we have to write about ferrys black body??

How can a perfectly black body realized in practice??Do we have to wri

1.	How can a perfectly black body realized in practice??Do we have to write about ferrys black body??
Answer» Dear student a perfectly black body is one which absorbs radiation of all wavelength INCIDENT on it its ABSORPTANCE is unity as it NEITHER reflect nor transmits any radiation. in ferry blackbody the radiation inside the enclosure whose inner walls are maintained at constant temperature has the same properties as black body radiation. and most of ENERGY entering through small hole of ferry blackbody is absorbed (99%)

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How can a perfectly black body realized in practice??Do we have to write about ferrys black body??

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