(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

The energy density is given as ## u = \frac { 8 \pi {\nu }^2}{c^3}~ \frac { h \nu} {e^{ \frac { h\nu}{k_B T}} – 1}.##

EDIT : I put the constant C.

## \frac { u( 2 \nu) } {u(\nu)} = C \frac { {e^{ \frac { h\nu}{k_B T}} – 1} }{ {e^{ \frac { 2h\nu}{k_B T}} – 1} } ##

Where C is the appropriate constant.

Is this correct?

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# Homework Help: Ratio of energy densities of black body radiation

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