In potassium at 68 GHz three consecutive cyclotron resonances are observed at magnetic fields of 0.74 T, 0.59 T and 0.49 T. What is the cyclotron resonance mass of electrons in potassium?

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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.