ifos โข paper_1 โข electrodynamics
[UPSC IFoS 2012] Black Body Radiation (Q464, 10M)
Find out the number of photons in a cavity of volume 1\cdot 00\text{ cm}^3 under thermal equilibrium at temperature T = 1000\ ^\circ\text{K}. Assume that \int_0^\infty \frac{x^2 dx}{e^x - 1} = 2\cdot 405.
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