Use Planck's equation to explain what happens to the color of a metal as it is heated. Discuss temperature and the spectrum given off as temperature changes. The frequency of the emission is related to the temperature. Discuss Planck's equation as E initial energy _ E final energy being equal to delta nav. Derive that were n=1, the equation becomes E=hv. Answer check your understanding questions from text. Introduce the duality of EM radiation.