For an electron to escape from the surface of a particular metal, it needs to absorb a minimum of 6.75x10-19J of energy. Calculate the a) frequency b) wavelength of a photon with just enough energy to cause this.

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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.