explain ferrys black body
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Absorptive power is defined as the ratio of radiations absorbed by a body to the radiations incident on it. ... Ferry designed an artificial black body using a hollow double walled sphere, wich is called Ferry's black body. In nature Black hole is a perfactly black body, it absorbs all radiations falling on it.
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a cavity with walls made of any material, with a small opening, is an excellent black body. This is Ferry's black body. It also absorbs all electromagnetic radiation incident on it irrespective of wavelength.
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