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Understanding Wave Interference and Superposition in Physics

This lecture provides an in-depth exploration of waves, focusing on the concepts of interference and superposition. Students will learn to define key terms such as wavelength, frequency, and wave velocity, and understand the differences between transverse and longitudinal waves. The session includes over 80 slides of animations to illustrate these concepts effectively. Assignments include reading from Chapters 16 and 17 and suggested problems for practice. Be prepared for collaborative discussions on wave interactions, such as how individual particle motions relate to wave motion.

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Understanding Wave Interference and Superposition in Physics

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  1. Today 1/16 • Waves • Interference of Waves • HW: 1/16 HW Handout “Superposition” Due Wed, 1/22 (beginning of class) • Read: Ch 16.1,2,5 Ch 17.1,2 • Suggest: Problems 16-1,2,3,4,5,8 • Note: This “lecture” is mostly animations and is more than 80 slides long! Beware the print button!

  2. Things to think about: Consider a traveling wave: sound, light, football stadium, water... How would you define a “wavelength?” How would you define a “frequency?” How would you define a “wave velocity?” How does the direction of the wave’s motion compare to the direction of the individual particle’s motion? What happens when two waves run into each other?

  3. How does the direction of the wave’s motion compare to the direction of the individual particle’s motion? Wave moves right while particles move up and down.Called a “transverse wave” Examples are light, water, and football stadium, sound is a “longitudinal wave.”

  4. Wavelength () = ?  = 8 units Wave Velocity (v) = ? Direction is to the right, v = x/t x is  and t is T, the time for a particle to go through one complete oscillation, as in SHM. v = /T v = f Frequency, f = 1/T also as in SHM.

  5. What happens when two waves collide?

  6. waves just meeting

  7. ? ? ? Superposition!!! Green wave says move up but blue wave says move down so... Particle does not move!! Superposition means “superimpose” all effects at a chosen location then add them up (as vectors) to get the “net” effect at that location.

  8. Only overlap here.the two waves are right on top of one another.

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