• (a) The first excited state of the sodium atom is 2.11 eV above the ground state. What wavelength radiation can cause transitions between these two levels? What sort of radiation is this? (visible, UV, etc.?) (b) Answer the same questions for the two 2p levels in hydrogen, which are shown in Fig. 9.7 and are 4.5 × 10−5 eV apart. (This is the fine-structure splitting discussed in Section 9.7.) (c) Answer the same questions for the lowest two levels of the 7Li nucleus. which are 0.48 MeV apart.
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