Question

what is blackbody radiation

Answer 1

An object that absorbs all radiation falling on it, at all wavelengths, is called a black body. When a black body is at a uniform temperature, its emission has a characteristic frequency distribution that depends on the temperature. Its emission is called black-body radiation. 

Answer 2

A object that absorb all the radiations falling on it, at all wavelength is called the black body.
When a black body is at an uniform temperature, it's emmision has a characteristic frequency distribution that depends upon temperature it's emission is called black body radiations

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