S117_2011_Part1_wrapup

S117_2011_Part1_wrapup - 3 What we teach Photoelectric...

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Romualdo T. deSouza, Indiana University 3. What we teach : Photoelectric effect (Lecture 3) • You may have encountered the photoelectric effect previously. Now you know about retarding potentials and how the experiment is actually done! • You were asked to move between graphical representations of results, formulas, and textual statements. This is a very important skill.
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Romualdo T. deSouza, Indiana University 3. What we teach : Particle in a 1D box (Lecture 4) Solve Schrodinger’s equation explicitly. Stress that quantization occurs because of the boundedness of the wavefunction Discuss the importance of nodes How does the “particle” move from one side of the box to the other in the first excited state if the probability in the middle is exactly zero? Realize how as the number of nodes increases the energy of the state also increases. Understand the relationship between the dimensionality of the problem and the number of quantum numbers (bounded in one dimension, one quantum number; bounded in two dimensions, two quantum numbers…)
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Romualdo T. deSouza, Indiana University 3. What we teach (Symmetry and Degeneracy) 2 2 2 8 mL h n E From the 1D box to the 2D box for a particle with independent motion 2 2 2 2 2 2 , 8 8 y x k n mL h k mL h n E What happens when L x = L y ? Degeneracy Degeneracy teaches us about the symmetry of the potential!
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S117_2011_Part1_wrapup - 3 What we teach Photoelectric...

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