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AP1200_Ch3_Waves-4Interf_Refl_Transm-2008

# AP1200_Ch3_Waves-4Interf_Refl_Transm-2008 - AP1200 3 Waves...

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1 AP1200 – 3. Waves Concepts AP1200 – 3. Waves Concepts 3.4 Wave interference, 3.4 Wave interference, reflection and transmission reflection and transmission Michel A. Van Hove Michel A. Van Hove WARNING: PRINTING THIS DOCUMENT WILL USE MUCH INK AND WILL NOT SHOW ANIMATIONS.

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2 How do waves interact with each other? Interference How do waves interact with each other? Interference Two waves simply add to each other: A sum = A 1 + A 2 This is principle of superposition (addition of wave amplitudes ) Weak waves do not change each other: they are independent 6
3 How do waves interact with each other? Interference How do waves interact with each other? Interference Two waves simply add to each other: A sum = A 1 + A 2 (addition of wave amplitudes ) A sum A 1 A 2 A See also http://www.kettering.edu/~drussell/Demos/superposition/superposition.html 8

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4 Peer discussion: standing wave Peer discussion: standing wave Two opposite traveling waves also add to each other, forming a standing wave : A sum A 1 A 2 5
5 How do waves interact with each other? Interference How do waves interact with each other? Interference Two opposite traveling waves also add to each other, forming a standing wave : Constructive interference ( in phase ): Destructive interference ( in antiphase ): A sum A 1 A 2 A standing wave has no net direction of motion See also http://schools.matter.org.uk/Content/Interference/superpositionActive.html Intermediate interference ( out of phase ): 6

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6 Consider two identical pulses with opposite amplitudes traveling toward each other along the same string, as shown, and let them interfere (not shown). Which statement is true? 1. There is a moment when the string is completely straight.
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AP1200_Ch3_Waves-4Interf_Refl_Transm-2008 - AP1200 3 Waves...

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