The Sun’s radiative power output is 3.846 × 1026 W and its emission spectrum peaks at 501.5 nm. Wien’s constant is 2.898 × 10−3 m ∙ K. a) Which region of the electromagnetic spectrum does the Sun’s peak-emission wavelength belong to? b)Calculate the surface temperature of the Sun: c)How much energy does one peak-emission photon carry? d)Estimate the number of photons leaving the Sun’s surface each second:

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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.