Suppose you measure spectrum of a 40W incandescent light bulb which peaks at a wavelength of 576 nm. Using Wein's displacement law, (eq 1 given above) find the temperature of the source. Using the temperature you found in 1, find the surface area of the 40 W light bulb (use equation 2 assuming ɛ =1 and make a reasonable assumption on temperatures for this calculation. Also, use o = 5.67 x 10*$ W/m²K*).

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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.