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For the thermal radiation from an ideal blackbody radiator with a surface temperature of 2100 K,...

For the thermal radiation from an ideal blackbody radiator with a surface temperature of 2100 K, let Ic represent the intensity per unit wavelength according to the classical expression for the spectral radiancy and Ip represent the corresponding intensity per unit wavelength according to the Planck expression. What is the ratio Ic/Ip for a wavelength of (a) 400 nm (at the blue end of the visible spectrum) and (b) 210 μm (in the far infrared)? (c) Does the classical expression agree with the Planck expression in the shorter wavelength range or the longer wavelength range?

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genius_generous answered 2 years ago
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