The first paper by Iris Runge (“RUN-guh”) was a collaboration with this physicist that included a predecessor of the WKB method. This physicist was succeeded by the pro-Nazi professor Wilhelm Müller shortly before he published his classic six-volume Lectures on Theoretical Physics. A so-called “Bible” for 1920s quantum physicists was this scientist’s textbook Atomic Structure and Spectral Lines. This physicist received a record 84 nominations for the Nobel Prize in Physics without winning. At Munich, this physicist’s PhD students included Peter Debye (“deh-BYE”), Wolfgang Pauli, and Werner Heisenberg. This physicist, who introduced the fine-structure constant in an update of a model that also added elliptical quantized electron orbits, co-names the free-electron gas model with Paul Drude (“DROO-duh”). For 10 points, what German physicist extended the Bohr model of the atom? ■END■
ANSWER: Arnold Sommerfeld [or Arnold Johannes Wilhelm Sommerfeld; accept Bohr–Sommerfeld model; accept Drude–Sommerfeld model]
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