EntityQ2566926· pop 21· linked from 298 articlesold quantum theorySign in to saveset of heuristic corrections to classical physics that served as a predecessor to modern quantum mechanics (1900–1925)ConnectionsSchrödinger's catEntityBohr modelEntitywave–particle dualityEntityscatteringEntityzero-point energyEntitydegenerate energy levelEntityAlbert EinsteinPersonQ7085EntityMax PlanckEntityquantum mechanicsEntityInternational Standard Book NumberEntityErwin SchrödingerEntityJames Clerk MaxwellEntitythermodynamicsEntityWerner HeisenbergEntitynanotechnologyEntityclassical mechanicsEntityPaul DiracEntityphotonEntityJohn von NeumannEntityCategoriesFoundational quantum physicsHistory of physicsOld quantum theory