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 P: 36 Can someone tell me how I can derive Wien's law, i.e., $\lambda_{max} T = constant$ where $\lambda_{max}$ is the peak wavelength and $T$ is the absolute temperature of the black body, using the equation, $P=\frac{U^{*}}{3}$ where $U^{*}$ is the energy density. Note: I'm not looking for the derivation using Plank's formula. I'm looking for a purely thermodynamic derivation. Thanks in advance!!