1 was there a stage in the development of atomic physics in, Ask an Expert

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1. Was there a stage in the development of atomic physics in which models played a role comparable to that now played by models in nuclear physics? Are models used now in atomic physics?

2. In those regions of the universe where thermal energy is kT ~ 10 6eV, are atomic processes more apparent than nuclear processes? What about those regions where kT ~ 10 ^-6eV?

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