Infrared Wavelength

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Do different materials (i.e. granite, steel, water, etc.), all at the same temperature, emit the same infrared wavelength?
 
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Do different materials (i.e. granite, steel, water, etc.), all at the same temperature, emit the same infrared wavelength?
For the most part, yes. See 'kirchoff's[/PLAIN] [Broken] law'

They will emit the same radiation if you think of them as perfect 'black bodies' (basically the simplest model of a thermal emitter). But materials are not perfect black bodies, and thus exhibit some differences in their spectra---largely from emission/absorption lines
 
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Thank You.
 
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But they may not be observed [measured] as such when viewed from a distance, [redshift,blue shift] etc..
 

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