Chapter 33 Early Quantum Theory and Models of the atom Chapter 33 Early Quantum Theory and models of the atom 1. Planck's Quantum Hypothesis 2 The photoelectric Effect 3. Compton Effect 4. Wave Nature of matterChapter 33 Early Quantum Theory and Models of the Atom Chapter 33 Early Quantum Theory and Models of the Atom 1. Planck’s Quantum Hypothesis 2. The Photoelectric Effect 3. Compton Effect 4. Wave Nature of Matter