Infrared radiation has frequencies below the red part of the visible spectrum so its wavelengths are: a. longer than that of visible light. b. shorter than that of visible light. c. the same as that of visible light. d. Specification of frequency does not limit the value of l. e. none of these.

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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.