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[ noun ] a hypothetical object capable of absorbing all the electromagnetic radiation falling on it
Synonyms Used in print (Cornell H. Mayer, "Radio Emission of the Moon...)The observed intensity of the radio_emission of Venus is much higher than the expected thermal intensity , although the spectrum indicated by measurements at wave_lengths near 3 cm and 10 cm is like that of a black_body at about 600 ` K . This result suggests a very high_temperature at the solid surface of the planet , although there is the possibility that the observed radiation may be a combination of both thermal and non thermal components and that the observed spectrum is that of a black_body merely by coincidence . For the case of Jupiter , the radio_emission spectrum is definitely not like the spectrum of a black-body radiator , and it seems very likely that the radiation reaching the earth is a combination of thermal radiation from the atmosphere and non thermal components . The concept of apparent black-body temperature is used to describe the radiation received from the moon and the planets . The received radiation is compared with the radiation from a hypothetical black-body which subtends the same solid_angle as the visible disk of the planet . Related terms |
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[ noun ] a hypothetical object capable of absorbing all the electromagnetic radiation falling on it
Synonyms Examples "a black body maintained at a constant temperature is a full radiator at that temperature because the radiation reaching and leaving it must be in equilibrium" Related terms |
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