Of the four processes indicated below, indicate which are radiative processes: A) absorption,     B) fluorescence,     C) vibrational relaxation,     D) internal conversion Explain it briefly.

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Wien's displacement law

Students often get confused between Wien's displacement law and Planck's radiation law. Although both are historically related, yet they are conceptually different. Planck's law helps determine the spectrum of a blackbody, while Wien's law determines the relationship between peak wavelength and temperature.