Planck's law is a mathematical relationship for the spectral radiance emitted by a blackbody (i.e. a body that absorbs all radiant energy falling on it) at a given temperature as a function of frequency or wavelength. Wien’s displacement law is the relationship between the temperature of a blackbody and the wavelength at which it emits the most radiation. Wien found that the product of the peak wavelength and the temperature is an absolute constant. As far as the temperature T of the blackbody increase the intensity of the e.m.radiation emitted increase being, at whatever wavelength, grater than the one emitted by a blackbody at lower temperature (Planck). As far as the blackbody temperature increase its maximum emission occurs at lower and lower wavelengths. Wien's law is fundamental both in the selection of the spectral bands more appropriate for observing specific phenomena as well as for remotely retrieve temperature of far objects by the analysis of the emitted spectral radiances.
Explain how Planck function and Wien law can help to characterize blackbodies' emission
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