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## Homework Statement

Suppose that a blackbody spectrum is specified by Spectral Radiancy [tex]R_{T} (\nu) d\nu[/tex] and Energy Density [tex]\rho_{T} (\nu) d\nu[/tex] then show that

[tex]R_{T} (\nu) d\nu = \frac {c}{4}\cdot \rho_{T} (\nu) d\nu[/tex]

## Homework Equations

[tex]\rho_{T} (\nu) d\nu = \frac{8 \pi h \nu^{3} d\nu}{c^{3}(e^{\frac{h\nu}{kT}}-1)}[/tex]