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The schedule for physics 122 class, including homework assignments, readings, and exam information. It also covers concepts related to plane waves, magnetic materials, and interference, including the results from maxwell's equations, different types of magnetic behavior, and the basics of interference. Students are encouraged to finish chapter 32 and prepare for exam 3.
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HW 10: due today by noon. HW 11: ch. 30, problems 22, 27, and 28, and ch. 32, problems 11, 12, and 21. Due a week from today (Wed. Nov. 19). Reading: Finish chapter 32 this week. Mastering Physics: new assignment due Tuesday. Exam 3: (through chapter 29) will likely be Friday of next week. I will update the study guide and cheat sheet before this weekend.
Electromagnetic “Plane Waves”:
Results from Maxwell's equations: the plane waves only satisfy the equations if all of the following are true:
Different frequencies of EM radiation get different names...
Magnetic Materials: (ch. 27) If we put a material in a magnetic field, three types of behavior are possible:
Clickers: Why didn't we give you the force rule between two permanent magnets?
Total Internal Reflection for large angles going to a material with smaller n. (Is this whale thinking about fiber optics? You decide.)
Basics of Interference (of any type of wave: light, sound, surf,...)
Two-source interference
Two-source interference For small angles, we can use the approximation sin θ ≈ tan θ. If measured in radians, both of these are also approximately θ itself (for small angles)! In that case, we can replace sin θ by y/L.