1. Wave Interaction Chapter 20.3

2. Reflection Occurs when a wave “bounces” off a barrier Examples –Echoes –Light reflection (Moon) Return to Wave Interactions Click for animation

3. Refraction The bending of a wave as it passes at an angle from one medium to another. Example – looking into water. Return to Wave Interactions Click on the picture to learn more

4. Diffraction Bending of waves around a barrier or through an opening. Return to Wave Interactions Click on the picture to learn more

5. Interference Two waves can occupy the same space The overlapping of two + more waves Constructive Interference increases amplitude Destructive Interference decreases amplitudeDestructive Return to Wave Interactions Click on the picture to learn more

6. Constructive Interference When the amplitude of two waves is in the same direction, the resultant wave is the addition of each waves amplitude. This is called constructive interference.

7. Destructive Interference When the amplitude of two waves is in the opposite direction, the resultant wave is the difference of each waves amplitude. This is called destructive interference. When resultant wave has zero amplitude, it is called complete destructive interference

8. Constructive interference or destructive interference? Constructive interference

9. What kind of wave is this? Transverse wave