Question #282972

Using Rayleigh-Jeans formula, find the total energy density. Can you explain Stefan-Boltzmann



law from this? Explain your answer.

1
Expert's answer
2022-02-07T15:16:41-0500

We know that

Rayleigh-Jeans formula,

ρw=hw3π2c3×1ehwkT1\rho_w=\frac{hw^3}{\pi^2 c^3}\times\frac{1}{e^{\frac{hw}{kT}-1}}

total energy density Stefan-Boltzmann

U=0nρwdwU=\smallint_0^n\rho_wdw

where n=infinite

U=hπ2c30nw3dwe(hwkT1)=π2k415c3h3T4U=\frac{h}{\pi^2c^3}\smallint_0^n\frac{w^3dw}{e^{(\frac{hw}{kT}-1)}}=\frac{\pi ^2k^4}{15c^3h^3}T^4

U=αT4U=\alpha T^4


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