BLACKBODY SPECTRAL INTENSITY

The wavelength (λmax) at which the spectral intensity is a maximum for each absolute temperature, T, is given by Wien’s displacement law:

λmax = 2897.8 T^-1 microns

The locus of these maxima is shown by the dashed red line in the above graph. For example, at an absolute temperature of 1250°K the maximum would occur at 2.32 microns. Also, the spectral intensity (W_λ) at λ max is given by,

W_λ = 1.288 x 10^-15 T⁵watts cm^-2 micron^-1

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