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Reflections and Superposition Reflections and Superposition

Reflections and Superposition - PowerPoint Presentation

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Uploaded On 2016-09-14

Reflections and Superposition - PPT Presentation

Contents Reflections Why they occur Preventing Types Angles Superposition Definition ConstructiveDestructive Why Reflections Occur Reflections occur at any abrupt change in medium Demo wave device Fixed Free change ID: 466366

reflections change abrupt occur change reflections occur abrupt angle demo reflection phone ohms wave preventing mirror system reflectionsreflections ways

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Presentation Transcript

Slide1

Reflections and Superposition

Contents:

Reflections

Why they occur

Preventing

Types

Angles

Superposition

Definition

Constructive/DestructiveSlide2

Why Reflections Occur

Reflections occur at any

abrupt change in mediumDemo wave device - Fixed, Free, changeSlide3

Why Reflections Occur

Reflections occur at any

abrupt

change in medium

Light Reflecting

Slide4

Why Reflections Occur

Reflections occur at any

abrupt

change in medium

Sound Reflecting

Slide5

Why Reflections Occur

Reflections occur at any

abrupt change in mediumMore examples: Waves off islands - Polynesian navigators

Long Distance telephone calls:

Your

phone

Their

phone

US Phone system

Cable or satellite

French phone systemSlide6

Preventing reflections

Reflections occur at any

abrupt change in medium2 ways to prevent reflection:Make there be no change in medium

Make the change less abrupt (i.e. gradual)

8

ohms

4

ohms

Your Stereo

Your Speaker

8

ohms

4

ohms

Impedance

TransformerSlide7

Preventing reflections

Reflections 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)

More examples: -

Wave device demo

Coatings on telescope lenses

Acoustic impedance transformer (demo)

Bells on hornsSlide8

An anechoic room

Wave energy is dissipated

Note lack of reflective surfaces

Voice of tour guideSlide9

Types of reflections:

Fixed ends invert:

(demo)

Free ends do not:

(demo)Slide10

Angle of incidence = angle of reflection:

Note unusual measure of angle

Right angle corners

(prisms and Mt. St. Helens center)

Demo -

laser/physics grooming mirror/Wash. Sq. Mall/sound in cornersSlide11

Angle of incidence = angle of reflection:Slide12

Smooth surfaces vs. rough

Every object reflects some light

Not always a mirrorSlide13

Field Trip time:

Hallway/commons

Lecture hall