Stefan-Boltzmann Law: IvdvcosΘdw Explained

  • #1
Apashanka das
32
0
I am having a doubt of why is the radiative flux IvdvcosΘdw in equilibrium integrated for a spherical black body only from 0 to pi/2 not pi(e.g. For the entire surface for which it is zero),
v=frequency
dw= solid angle
 
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  • #2
It is a surface, it can only emit radiation in one hemisphere.
 

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