A. Zee, Quantum Field Theory in a Nutshell · Problem N.1.1

Field Theory Redux

Physics — QFT

Problem

Using considerations similar to those in the text, show that the scattering cross section for a photon of frequency ω\omega on an atom or a molecule vanishes like ω4\omega^4 as ω→0\omega \to 0, a result which, as mentioned in chapter VIII.3, underlies the well-known explanation of why the sky is blue.

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