1. Spin Quantum Number and Spin Example: Electron, s = ½ (fermion) Implications? Spin angular momentum is INTRINSIC to a particle mass charge spin More  Spin COMPONENT quantization Examples: s = ½ s = 1 (Similar for x, y components) Example: Electron, s = ½ (fermion)

3. ConcepTest #75

4. Identical Particles, Indistinguishable Particles, and Joint Probabilities Probability for particle 1 and particle 2 to end up in states  and  : Distinguishable particles Identical Bosons Identical Fermions Slightly more/different explanation in CH 35, Sec. 35-6 What happens if states  and  are the same;  CONSEQUENCES:

5. What happens if there are more particles? What happens if the box is more than one dimension?

6. ConcepTest #76 What is the wavelength of this photon?

7. FluorescencePhoton-Atom Interactions

8. Population Inversions, Metastable States, and Lasers

9. Energy Levels in the Hydrogen Atom:

10. Bohr Model Postulates?