I Perfect" Radiators & Absorbers: Why Materials Differ

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Materials differ in their behavior as radiators and absorbers due to variations in their ability to absorb and emit different wavelengths of energy. A "perfect" radiator and absorber would absorb 100% of incoming energy without reflection and emit energy according to the blackbody spectrum. While all objects eventually release all absorbed heat energy at thermal equilibrium, they do not necessarily follow the ideal blackbody curve in their emission. Real materials exhibit preferential emission and absorption characteristics, leading to differences in their thermal performance. Understanding these properties is essential for applications in thermal management and energy efficiency.
pkc111
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Why are some materials behave more like black-bodies than others?
What does it mean a "perfect" radiator and absorber? All objects give off 100% of the heat energy given to them eventually if they are at the same temperature as their environment...right?
 
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pkc111 said:
Why are some materials behave more like black-bodies than others?
A blackbody is an idealized object. Real objects will not absorb all wavelengths equally.

pkc111 said:
What does it mean a "perfect" radiator and absorber?
It means 100% absorption at any wavelength (no reflection). Perfect emission corresponds to the blackbody spectrum.

pkc111 said:
All objects give off 100% of the heat energy given to them eventually if they are at the same temperature as their environment...right?
Yes, but an actual object will not emit following the exact blackbody curve. Some wavelengths will be favored with respect to others.
 
Thanks a lot that makes sense!
 

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