1. Wave Interactions

2. 6 Wave Interactions
When a wave encounters a surface, 6 interactions can occur
Interference
Diffraction
Reflection
Absorption
Refraction
Polarization

3. 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
Destructive Interference – when waves add up to make a smaller or zero wave amplitude (cancel each other out)

4. Constructive Interference

5. Constructive Interference
Crest to Crest Trough to Trough

6. Destructive Interference

7. Destructive Interference
Crest to Trough

9. 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

10. Result of Resonance

11. Result of Resonance
Glass shattering Tacoma Narrows Bridge collapsing Tuning forks vibrating

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

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

14. Refraction

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

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

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