Reflections and Superposition Contents: Reflections Why they occur Preventing Types Angles...
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Transcript of Reflections and Superposition Contents: Reflections Why they occur Preventing Types Angles...
![Page 1: Reflections and Superposition Contents: Reflections Why they occur Preventing Types Angles Superposition Definition Constructive/Destructive.](https://reader034.fdocuments.net/reader034/viewer/2022051622/5697bfbc1a28abf838ca13a5/html5/thumbnails/1.jpg)
Reflections and SuperpositionContents:
•Reflections•Why they occur•Preventing•Types•Angles
•Superposition•Definition•Constructive/Destructive
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Why Reflections Occur
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Reflections occur at any abrupt change in mediumDemo wave device - Fixed, Free, change
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Why Reflections Occur
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Reflections occur at any abrupt change in mediumLight Reflecting
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Why Reflections Occur
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Reflections occur at any abrupt change in mediumSound Reflecting
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Why Reflections OccurReflections occur at any abrupt change in medium
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More examples: Waves off islands - Polynesian navigators Long Distance telephone calls:
Your phone
Their phone
US Phone system
Cable or satellite
French phone system
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Preventing reflectionsReflections occur at any abrupt change in medium
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2 ways to prevent reflection:Make there be no change in mediumMake the change less abrupt (i.e. gradual)
8 ohms
4ohms
Your Stereo Your Speaker
8 ohms
4 ohms
Impedance Transformer
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Preventing reflectionsReflections occur at any abrupt change in medium2 ways to prevent reflection:
Make there be no change in mediumMake the change less abrupt (i.e. gradual)
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More examples: -Wave device demo Coatings on telescope lensesAcoustic impedance transformer (demo)Bells on horns
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An anechoic room
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Wave energy is dissipatedNote lack of reflective surfacesVoice of tour guide
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Types of reflections:
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Fixed ends invert: (demo) Free ends do not: (demo)
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Angle of incidence = angle of reflection:
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Note unusual measure of angleRight angle corners(prisms and Mt. St. Helens center)Demo - laser/physics grooming mirror/Wash. Sq. Mall/sound in corners
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Angle of incidence = angle of reflection:
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Smooth surfaces vs. rough
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Every object reflects some lightNot always a mirror
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Field Trip time:Hallway/commons
Lecture hall