Transcript
Page 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:

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!

Page 2: 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:

Things to think about:

How would you define a “wavelength?”

How would you define a “frequency?”

How would you define a “wave velocity?”

What happens when two waves run into each other?

Consider a traveling wave: sound, light, football stadium, water...

How does the direction of the wave’s motion compare to the direction of the individual particle’s motion?

Page 3: 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:
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Page 12: 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:

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.”

Page 13: 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:
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Page 38: 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:

Wavelength () = ? = 8 units

Wave Velocity (v) = ? Direction is to the right, v = x/t

v = /Tx is and t is T, the time for a particle to go through one complete oscillation, as in SHM.

Frequency, f = 1/T also as in SHM.v = f

Page 39: 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:

What happens when two waves collide?

Page 40: 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:
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waves just meeting

Page 44: 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:

?

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.

Page 45: 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:
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Only overlap here.the two waves are right on top of one another.

Page 48: 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:
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Now let’s put this in motion.

Page 58: 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:

Destructive interference Constructive interference

Page 59: 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:

Destructive interference Constructive interference

Page 60: 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:

Destructive interference Constructive interference

Page 61: 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:

Destructive interference Constructive interference

Page 62: 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:

Destructive interference Constructive interference

Page 63: 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:

Destructive interference Constructive interference

Page 64: 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:

Destructive interference Constructive interference

Page 65: 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:

Destructive interference Constructive interference

Page 66: 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:

Destructive interference Constructive interference

Page 67: 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:

Destructive interference Constructive interference

Page 68: 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:

Destructive interference Constructive interference

Page 69: 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:

Destructive interference Constructive interference

Page 70: 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:

Destructive interference Constructive interference

Page 71: 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:

Destructive interference Constructive interference

Page 72: 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:

Destructive interference Constructive interference

Page 73: 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:

Destructive interference Constructive interference

Page 74: 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:

Destructive interference Constructive interference

Page 75: 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:

Destructive interference Constructive interference

Page 76: 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:

Destructive interference Constructive interference

Page 77: 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:

Destructive interference Constructive interference

Page 78: 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:

Destructive interference Constructive interference

Page 79: 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:

Destructive interference Constructive interference

Page 80: 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:

Destructive interference Constructive interference

This is a “standing wave” and is a “superposition” of two traveling waves. These two waves “interfere” with each other causing locations of “constructive” and “destructive “ interference.

Page 81: 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:

Destructive interference Constructive interference

Note that the locations of “constructive” and “destructive “ interference alternate. These locations are called “nodes” (destructive) and “anti-nodes” (constructive).

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Your first Homework...


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