- #1
Lapidus
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I read somewhere on the net that almost 100 percent of radiation in the universe is thermal.
What then is nonthermal radiation? Can it be said that blackbody radiation is purely thermal?
What about all the radiation that is reflected, diffracted or partly transmitted by bodies, is that nonthermal radiation?
I also read that emission of photon by atoms when they jump into lower states is thermal radiation. How can this be? That has nothing to do with heat.
thanks
What then is nonthermal radiation? Can it be said that blackbody radiation is purely thermal?
What about all the radiation that is reflected, diffracted or partly transmitted by bodies, is that nonthermal radiation?
I also read that emission of photon by atoms when they jump into lower states is thermal radiation. How can this be? That has nothing to do with heat.
thanks