n A blackbody is a theoretical construct that absorbs all of        the ratiation falling on it (hence the name) n Measured frequencies and wavelengths of a        blackbody at different temperatures n Wien's law (experimental)         l at peak = 2.90x10-3 mK

n Planck's Quantum Hypothesis - 1900

        Ø The energy of oscillations of atoms within molecules are restricted to certain values

        Ø E = hf where h is Planck's constant = 6.626x10^-34Js

        Ø So, the energy can only be some whole number multiple of hf

        Ø E = nhf where n is some integer