Spectral energy density units

  • Thread starter Fr34k
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  • #1
Fr34k
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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?
 

Answers and Replies

  • #2
36,243
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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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