Question
Sun September 04, 2011 By:

black body radiation

Expert Reply
Mon September 05, 2011
 An ideal body which is a perfect absorber and perfect emitter of radiation is called a black body. When such a body is heated it becomes red hot .As the temperature further increased , the colour of the radiation emitted changes from red to yellow to whiteand finally to purple,showing that the wavelength of  radiation emitted decreases by increase in temperature, these radiation are emmitted from the surface of the body hence such properties cannot be explained on the basis of wave theory of electromagnetic radiation.
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