A Black Body Radiation Spectrum - Lecture 24 Highlights | PHYS 402, Study notes of Quantum Physics

Download A Black Body Radiation Spectrum - Lecture 24 Highlights | PHYS 402 and more Study notes Quantum Physics in PDF only on Docsity! Lecture 24 Highlights A black body radiation spectrum has an energy density (energy per unit volume per unit frequency) given by Planck’s formula: 1 )( / 3 32 − = TkBec ω ω π ωρ h h , (1) where ω is the angular frequency of the radiation, is Boltzmann’s constant, and T is temperature of the blackbody radiator. On pages 352 354 of Griffiths there is a calculation of the rate of absorption of this type of radiation by a two-level atom (states andb ) assuming random polarization of the light: Bk a ( ) ababababababba MzyxeR )(3 )( 222 2 0 2 ωρ ε ωρπ ≡++=→ h , where abab EE ωh=− , and the term in parentheses contains the three Cartesian matrix elements between states a and b.