On a clear evening during the winter months, if you look up at the sky, you can see the constellation Orion (The Hunter). One star is this constellation Rigel, flickers in a blue color (λ = 400 nm), and another star, Betelgeuse, has a reddish color (λ = 750 nm). What is the difference of the surface temperature for these two stars?

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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.