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Use the Planck distribution law (7.28) to calculate the total energy density of a black-body at...

Use the Planck distribution law (7.28) to calculate the total energy density of a black-body at a temperature of 3000K? (7.28)--> U(f)df=[(8(pi)f^2)/c^3]*[hf/(e^(hf/KT)-1)]

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