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Spectral energy density units

  1. Sep 10, 2012 #1
    I will just paste the link, cause its faster this way:

    http://scienceworld.wolfram.com/physics/PlanckLaw.html

    The last equation for spectral energy density if you look at the units you get eVs/m^3 or Js/m^3, yet energy density is supposed to be J/m^3. What am I missing here?
     
  2. jcsd
  3. Sep 10, 2012 #2

    mfb

    User Avatar
    2017 Award

    Staff: Mentor

    It is a density per frequency (and space). To get the total (spatial) energy density, you have to integrate over the whole frequency range (0 to infinity).
     
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