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Blackbody
absorbs (& re-emits) all energy
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falling
onto it
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characteristic of any opaque surface (e.g. stove
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burner
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depends only on T of surface (not shape or
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composition)
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Kirkoff�s
Law : perfect absorber = perfect
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emitter
= Blackbody
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Intensity
of radiation versus frequency
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blackbody curve
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