Can someone point out any information (derivation or where it comes from) about this equation:(adsbygoogle = window.adsbygoogle || []).push({});

[tex]S = v\int_0^\infty\phi(\rho,\nu)d\nu[/tex]

[tex]\nu[/tex] is frequency of radiation. [tex]\rho(\nu)[/tex] is radiation energy, v is volume.

I'm getting this from Einstein's photoelectric effect paper.

Thanks a lot!

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# Entropy of blackbody radiation

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