Wien's Law

Wien's Law tells us that objects of different temperature emit spectra that peak at different wavelengths.

  • Hotter objects emit most of their radiation at shorter wavelengths; hence they will appear to be bluer .

  • Cooler objects emit most of their radiation at longer wavelengths; hence they will appear to be redder.

Furthermore, at any wavelength, a hotter object radiates more (is more luminous) than a cooler one.

Read also about Planck's Law of blackbody radiation at the Wiki Encyclopedia page at http://en.wikipedia.org/wiki/Planck's_law_of_black_body_radiation


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