I'm looking for a conceptual explanation of a formula in Quantum Mechanics Demystified introduction. They introduce you to the theoretical black body radiation experiment, where demonstrated how a classical approach leads to the ultraviolet catastrophe.(adsbygoogle = window.adsbygoogle || []).push({});

In the explanation they have the following formula for energy density u([itex]\nu[/itex],t):

u = ( number degrees of freedom for frequency [itex]\nu[/itex]) x (average energy per degree of freedom)

My understanding is that that degrees of freedom is the number of variables that you can vary in the formula.

Since the degrees of freedom vary, I'm assuming that under certain temperatures and frequencies, the formula can be simplified and reduced? This would in turn change the degrees of freedom? Please let me know if I'm understanding it correctly.

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Degrees of freedom in the energy density formula for black body radiation

Can you offer guidance or do you also need help?

Draft saved
Draft deleted

**Physics Forums | Science Articles, Homework Help, Discussion**