WAVES
Mr. Bak
This 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.loncapa.org/~mmp/applist/doppler/d.htm
Are Waves a good or a bad
thing?