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What's the meaning of "Density of radiation between f to f+d

  1. Feb 28, 2015 #1
    I know Density of energy is the amount of energy of photons per unit volume, but what do you mean by giving the range of frequency between f to f + df ???
     
  2. jcsd
  3. Feb 28, 2015 #2

    blue_leaf77

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    This means the energy density is a function of frequency.
     
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