2. Warm Up 11-6-15 1) What type of wave is sound? (Transverse or Longitudinal) What is the medium that sound travels through? 2) If I had a black plate and a white plate, which do you think would get hotter sitting in the sun? Why? 7) If I had a red plate and a violet plate, which do you think would get hotter sitting in the sun? Why? 19) If I am wearing a yellow shirt, which color(s) of visible light are reflected off of it? Which color(s) are absorbed by it? 28 ) If I have a machine that emits Radio Waves and Ultra Violet waves and I point it at the moon, which wave will arrive there first?

3. Warm Up 11-6-15 1) What type of wave is sound? (Transverse or Longitudinal) What is the medium that sound travels through? 2) If I had a black plate and a white plate, which do you think would get hotter sitting in the sun? Why? 3) If I had a red plate and a violet plate, which do you think would get hotter sitting in the sun? Why? 4) If I am wearing a yellow shirt, which color(s) of visible light are reflected off of it? Which color(s) are absorbed by it? 5 ) If I have a machine that emits Radio Waves and Ultra Violet waves and I point it at the moon, which wave will arrive there first?

4. Warm Up 11-6-15 1) What type of wave is sound? (Transverse or Longitudinal) What is the medium that sound travels through? 2) If I had a black plate and a white plate, which do you think would get hotter sitting in the sun? Why? 3) If I had a red plate and a violet plate, which do you think would get hotter sitting in the sun? Why? 4) If I am wearing a yellow shirt, which color(s) of visible light are reflected off of it? Which color(s) are absorbed by it? 5 ) If I have a machine that emits Radio Waves and Ultra Violet waves and I point it at the moon, which wave will arrive there first?

5. 6 Wave Interactions  Interference  Reflection  Refraction  Diffraction  Absorption  Polarization When a wave encounters a surface, 6 interactions can occur

6. Interference Interference – when two or more waves meet in the same medium – Constructive Interference – when two waves add up to make a larger wave amplitude Constructive – Destructive Interference – when waves add up to make a smaller or zero wave amplitude (cancel each other out) Destructive

7. Constructive Interference

8. Crest to Crest Trough to Trough

9. Destructive Interference

10. Crest to Trough

12. Result of Interference Resonance – occurs when vibrations travelling through an object match the object’s natural frequency – Also occurs when one object vibrates another object without touching it

13. Result of Resonance

14. Glass shattering Tacoma Narrows Bridge collapsing Tuning forks vibrating

15. Reflection Reflection – when a wave bounces off a material and goes in a new direction

16. Refraction Refraction – when a wave passes through a different material and bends

17. Refraction

18. Diffraction Diffraction – when a wave bends around or goes through a hole in a material

19. Absorption Absorption – when a wave is absorbed by the material and may disappear

20. Polarization Polarization – when waves move as a transverse and longitudinal waves but only one can get through VIDEO