e spectrum of radiation from a blackbody at a temperature of T = 3500 K reaches a maximum at the wavelength  . At what values of the length will be the maximum if the temperature is raised to T=5800 K.

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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.