Quantum physics (quantum theory, quantum mechanics)

Summary of 2 nd lecture
electron was identified as particle emitted in
photoelectric effect
Einstein’s explanation of p.e. effect lends further
credence to quantum idea
Geiger, Marsden, Rutherford experiment disproves
Thomson’s atom model
Planetary model of Rutherford not stable by classical
electrodynamics
Bohr atom model with de Broglie waves gives some
qualitative understanding of atoms, but
• only semi-quantitative
• no explanation for missing transition lines
• angular momentum in ground state = 0 (Bohr: 1 )
• spin??
2