Jacques Posted November 16, 2005 Share Posted November 16, 2005 Hi I have a simple question What are the quantum number needed to completly describe a photon ? Can we assing a vector to the direction of a free photon (a photon not yet detected) ? The one I know are the frequency, the momentum (not sure they are quantum number) Thanks Link to comment Share on other sites More sharing options...
swansont Posted November 16, 2005 Share Posted November 16, 2005 The k vector determines energy, momentum and frequency. In some kind of confined system, these would be determined by the allowed energy states, so you'd have a quantum number telling you the mode of the cavity. You have to specify the polarization, if the orthogonal states are allowed by the boundary conditions. Photons are spin 1, and can have spin projections of +1 or -1. Link to comment Share on other sites More sharing options...
Jacques Posted November 17, 2005 Author Share Posted November 17, 2005 Thanks for your answer. What is the k vector ? Energy depend on the frequency momentum depend on the energy So only the frequency is necessary to describe energy and momentum ??? You lost me with "mode of the cavity" What cavity are talking about ? Is polarization related to spin ? What is "spin projection" Is angular momentum the same thing as spin ? Thanks again for your time. Link to comment Share on other sites More sharing options...
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