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

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The discussion clarifies that the "Density of radiation between f to f + df" refers to the energy density of photons within a specific frequency range. This concept indicates that energy density is not a constant but varies as a function of frequency. The term "df" represents an infinitesimal change in frequency, emphasizing the continuous nature of energy distribution across frequencies.

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Sampad Saha
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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 ?
 
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This means the energy density is a function of frequency.
 
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