Using Rayleigh-Jeans formula, find the total energy density. Can you explain Stefan-Boltzmann
law from this? Explain your answer.
We know that
Rayleigh-Jeans formula,
ρw=hw3π2c3×1ehwkT−1\rho_w=\frac{hw^3}{\pi^2 c^3}\times\frac{1}{e^{\frac{hw}{kT}-1}}ρw=π2c3hw3×ekThw−11
total energy density Stefan-Boltzmann
U=∫0nρwdwU=\smallint_0^n\rho_wdwU=∫0nρwdw
where n=infinite
U=hπ2c3∫0nw3dwe(hwkT−1)=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^4U=π2c3h∫0ne(kThw−1)w3dw=15c3h3π2k4T4
U=αT4U=\alpha T^4U=αT4
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