A child has a temperature of 101◦F . If her total skin area is 2 m2 , find the energy loss per second due to radiation, assuming the emissivity is 1. Assume the room temperature is 70◦F. The Stephan-Boltzmann constant is 5.6696 × 10^−8 W/m2 · K 4 . Answer in units of W.

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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.