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Density of black body radiation

  1. Apr 9, 2007 #1
    I came across a formula that gives radiant energy density as 4 * sigma * T^4 / c. I am trying to figure out how this formula follows from Stefan-Boltzmann law. Shouldn't it be 4*pi instead of just 4? I am also wondering why one can just stick in c.

    TIA
     
  2. jcsd
  3. Apr 12, 2007 #2
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