1. German physicist who with James Franck proved the existence of the stationary energy states postulated by Bohr (1887-1975) • Syn: Gustav Hertz, Gustav Ludwig Hertz • Instance Hypernyms: nuclear physicist 2. German physicist who was the first to produce electromagnetic waves artificially (1857-1894) • Syn: Heinrich Hertz, Heinrich Rudolph Hertz • Derivationally related forms: Hertzian • Instance Hypernyms: physicist