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Calculate the energy density in the range 650 nm to 655 nm inside a cavity at (a) 25 °C, (b) 3000 °C. For this relatively small range of wavelength it is acceptable to approximate the integral of the energy spectral density ρ(λ,T) between λ₁ and λ₂ by ρ(λ,T)×(λ₂ − λ₁).

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