Question

what is black body radiation?

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Answer 1

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A blackbody refers to an opaque object that emits thermalradiation. A perfect blackbody is one that absorbs all incoming light and does not reflect any. At room temperature, such an object would appear to be perfectlyblack (hence the termblackbody).
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A blackbody is an idealized object which absorbs and emits all frequencies. Classical physics can be used to derive an equation which describes the intensity of blackbody radiation as a function of frequency for a fixed temperature — the result is known as the Rayleigh-Jeans law.
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A blackbody (sometimes spelled "black body") is a theoretically ideal radiator and absorber of energy at all electromagnetic wavelength s. The term comes from the fact that a cold blackbody appears visually black. The energy emitted by a blackbody is called blackbody radiation.
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Answer 2

Read these pages and it will be clear to u