1. Wave Interactions
Chapter 11 Section 3

2. Wave Interaction When a wave strikes a new medium
Some of the wave’s energy is reflected
Some of the wave’s energy is absorbed
The amounts depend on the new medium

3. Reflection Reflection: bouncing back from an interface
Reflection obeys the Law of Reflection
Angle of incidence equals angle of reflection
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4. Law of Reflection

5. Refraction When a wave travels from one medium into another medium
As the wave changes speed, it also changes direction
Wave slowing bends toward normal
Wave speeding up bends away from normal

6. Refraction

7. Diffraction Diffraction: wave bends around a small opening or corner
Occurs most if object is smaller than wavelength

9. Interference Two or more waves interact to form a resulting wave
Constructive: resulting wave has larger amplitude
Destructive: resulting wave has smaller amplitude

10. Which kind of interference?

12. Resonance
Vibration of one thing makes another thing vibrate at the same frequency (or a multiple)
Common in musical instruments
Also can happen here:
YouTube - Tacoma Bridge
YouTube - Ground Resonance - Side View