1) Work on the Satnding wave lab. Section 3 find the needed tension for 5,6, and 7 loops using mu = 9.17E-4, L=1.71, and f= 60 cycles/sec. Use the relationship between tension and n squared we ended up with in class today.
I asked you to repair the December Assignment. I meant to tell you to record your answers on the assignment so you could correct your errors without my returning what you handed in. Since I didn't do that and I still have them. Review the December assignment solutions, with corrections in prior posts, and see if you know can solve all the problems. If you can congratulations. If you can't then fix it so that you can. If you need help you know where to get it. If I don't here from you I will assume we do not need to address it in our pre midyear exam review.
2) Projects. Presentations so far have been mixed with several disappointments. Many do not reflect enough time invested or an attempt to understand rather than copy.
This is a course in concepts which ideally can be tested with quantitative predictions. What occurs, why it occurs, and an equation describing the relationships among quantities are what we are after here, not just a bunch of facts and formulas. Some things, like force between charges is a fact of the universe, but how that leads to magnetism can and should be explained. Why sound moves at a certain speed can also be explained and why wave speeds and lengths determine resonant frequencies can also be explained as can the energy in a wave.
Lasers are governed by quantitative behavior, etc.
I am hoping by next Friday every group will have done some real teaching and explaining.
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