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

2. Content What are waves Types Electromagnetic waves –AC current Ocean wave creation –movement Reflection Refraction Interference –Constructive/destructive Doppler Effect

3. What are Waves? Energy Transfer Does Medium Move?

4. 2 Types of Waves LongitudinalTransverse

5. Common Types of Waves Electromagnetic Waves –Light, Microwaves, X-rays, etc. –AC current Ocean Waves Sound

6. Electro Magnetic

7. Ocean Wave Creation Duration Speed Fetch

8. Wave Motion

9. Refraction Snell’s Law Ocean - shallow water –Wave moves slower Causes wrapping Light - change speed –Shallow –prism

10. Refraction Pictures

11. Wave Diffraction Encounters obstacle –Some energy blocked –What makes it through spreads –Longer wave length travels more effecently Red sunsets Bass travels better

12. Diffraction Picture

13. Interference 2 types of interference Constructive and Destructive –Phase

14. 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

15. Are Waves a good or a bad thing?