For the thermal radiation from an ideal blackbody radiator with a surface temperature of 2000K, let...

 

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For the thermal radiation from an ideal blackbody radiator with a surface temperature of 2000K, let I, 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) 400nm (at the blue end of the visible spectrum) and(b) 200um (in the far-infrared)?(c) Does the classical expression agree with the Planck expression in the shorter wavelength range or the longer wavelength range? For the thermal radiation from an ideal blackbody radiator with a surface temperature of 2000K, let I, 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) 400nm (at the blue end of the visible spectrum) and(b) 200um (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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