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--- classes:2009:fall:phys4101.001:q_a_1130 [2009/12/03 01:35] – olmschenk
+++ classes:2009:fall:phys4101.001:q_a_1130 [2009/12/16 00:44] (current) – czhang
@@ Line 52: / Line 52: @@
 ===Schrodinger's Dog 11/30===
 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.
+=== 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 <math>m_r=\frac{m_e*m_p}{m_e+m_p}</math>, mass of electron is negligible compare to proton, thus normally the reduced mass of electron is just m_e, but if we treated the electron stationary and nucleus evolving about electron, things would be different.
 ==== Blackbox 11/30 10:50am ====