3. Find the momentum of (a) a 10.0-MeV gamma ray; (b) a 25-kev X ray; (c)a1.0-um infrared photon; (d) a 150-MHz radio-wave photon. Express the momentum in kg •m/s and eV/c.

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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.