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Physics 122 Class Schedule and Concepts: Plane Waves, Magnetic Materials, and Interference, Assignments of Physics

New Mexico Institute of Mining & Technology (NMT)Physics

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.

Typology: Assignments

Pre 2010

Uploaded on 08/08/2009

koofers-user-7ef
koofers-user-7ef 🇺🇸

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Phys. 122-02: Wednesday, 12 November
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.
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Download Physics 122 Class Schedule and Concepts: Plane Waves, Magnetic Materials, and Interference and more Assignments Physics in PDF only on Docsity!

Phys. 122-02: Wednesday, 12 November

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:

  • S must point in direction of wave propagation.
  • E and B must be perpendicular to one another, and each perpendicular to S.
  • | E | = (c/n) | B |.
  • Wave speed v wave = c/n. Note that any frequency and wavelength are possible (as long as their product is c/n ).

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:

  • Diamagnetism: the original field can be reduced slightly (by induced currents – Lenz' Law). For a superconductor, the original field is cancelled completely (perfect diamagnetism).
  • Paramagnetism: the original field can be increased slightly, by alignment of small permanent current loops in the material.
  • Ferromagnetism: The original field can be increased dramatically, and the magnetism can persist when the original field is gone (this makes a “permanent” magnet).

Clickers: Why didn't we give you the force rule between two permanent magnets?

  • a) There is no force between them
  • b) The force is only explainable by invoking special relativity
  • c) The force rule is too complicated to be put in simple form
  • d) Permanent magnets aren't important enough
  • e) The force rule is top-secret, guarded by descendants of the medevial Physics Guild

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.