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| classes:2009:fall:phys4101.001:q_a_1130 [2009/12/02 19:43] – youmans | classes:2009:fall:phys4101.001:q_a_1130 [2009/12/16 00:44] (current) – czhang | ||
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| ====Dark Helmet 11/28 === | ====Dark Helmet 11/28 === | ||
| Can we perhaps get another count of Pre-lecture Q/A points? | Can we perhaps get another count of Pre-lecture Q/A points? | ||
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| + | === The Doctor === | ||
| + | Perhaps... | ||
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| ====Schrodinger' | ====Schrodinger' | ||
| On page 244, Griffiths mentions that he multiplies the degeneracy dk by 2 because of the spin. When we are talking about photons, I usually hear that this factor of 2 comes from the polarization of light, and the fact that it photons can only travel transversely. What is the story? Did we first think it was 2 when we working semi-classical(i.e. before modern QM) and then discovered spin, and accounted this factor of 2 because of spin in modern QM? | On page 244, Griffiths mentions that he multiplies the degeneracy dk by 2 because of the spin. When we are talking about photons, I usually hear that this factor of 2 comes from the polarization of light, and the fact that it photons can only travel transversely. What is the story? Did we first think it was 2 when we working semi-classical(i.e. before modern QM) and then discovered spin, and accounted this factor of 2 because of spin in modern QM? | ||
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| ===Schrodinger' | ===Schrodinger' | ||
| It takes into account the nucleus, when looking at the atom, and taking into account the nucleus allows you to see the fine-structure splitting, which is discussed in chapter 6. They simply replace m with mu, and you get a split in the regular energy levels you see. | It takes into account the nucleus, when looking at the atom, and taking into account the nucleus allows you to see the fine-structure splitting, which is discussed in chapter 6. They simply replace m with mu, and you get a split in the regular energy levels you see. | ||
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| + | === Can 12/16 === | ||
| + | It depends which particle you treated as stationary. Take the hydrogen atom as an example, for simplicity we treated the nucleus as stationary only the electron is rotating about the nucleus, which is not necessarily true. remember the reduced mass equation is < | ||
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| ==== Blackbox 11/30 10:50am ==== | ==== Blackbox 11/30 10:50am ==== | ||