WAVES

Mr. BakThis material is based upon work supported by the National Science Foundation under Grant No. NSF DGE-0742462

Content• What are waves• Types • Electromagnetic waves

– AC current

• Ocean wave creation– movement

• Reflection• Refraction• Interference

– Constructive/destructive

• Doppler Effect

What are Waves?

• Energy Transfer

• Does Medium Move?

2 Types of Waves

• Longitudinal •Transverse

Common Types of Waves

• Electromagnetic Waves– Light, Microwaves, X-rays, etc.– AC current

• Ocean Waves

• Sound

Electro Magnetic

Ocean Wave Creation

• Duration

• Speed

• Fetch

Wave Motion

Refraction

• Snell’s Law

• Ocean - shallow water– Wave moves slower

• Causes wrapping

• Light - change speed– Shallow– prism

Refraction Pictures

Wave Diffraction

• Encounters obstacle – Some energy blocked– What makes it through spreads– Longer wave length travels more effecently

• Red sunsets• Bass travels better

Diffraction Picture

Interference

• 2 types of interference

• Constructive and Destructive– Phase

Doppler Effect

• What is Doppler Effect?

• Mostly evident with Sound– As object emitting (sound) waves travels– The movement changes the wave length– Stack up– http://www.lon-capa.org/~mmp/applist/

doppler/d.htm

Are Waves a good or a bad thing?