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LOG#039. Relativity: Examples(III).
[latexpage] Example 1. Absorption of a photon by an atom. In this process, we have from momenergy conservation: $ P^\mu_a P_{a\mu}+2P^\mu_a P_{b\mu}+P^\mu_b P_{b\mu}=P^\mu_c P_{c\mu}$ If the atom i…