1. Wave Interactions

2. return of a wave when it reaches a boundary of a medium
Reflection
return of a wave when it reaches a boundary of a medium

3. 2 Types of Reflection: Fixed Boundary: the reflected wave is
inverted when it reflects
from a more dense medium
Free Boundary:
the reflected wave is
not inverted when it reflects
from a less dense medium

4. Reflection: Free vs. Fixed boundary

5. Refraction bending of a wave passing from one medium into another
Wave changes speed
For refraction to occur, the wave
must change speed and must enter
the new medium at an angle.

6. Refraction: Why waves always go into the shore

7. Diffraction the spreading of a wave around a barrier or
through an opening

8. Diffraction & Reflection
Island vs. Pillar
Diffraction & Reflection

9. Superposition Principle
Interference
Two or more waves passing through the same location at the same time.
Also called: superposition
Superposition Principle
The total displacement due to interference is the sum of the displacements of the individual waves

10. results in a larger amplitude results in a smaller amplitude
Types of Interference
Constructive
results in a larger amplitude
Destructive
results in a smaller amplitude

11. Wave Interference Video
Chapter 14 Section 3
Wave Interference Video

12. Interference Application
Destructive interference used for our benefit
Noise Cancellation Technology
Cars
Headphones
Dentist Drills
Factories

13. Resonance
Resonance: Large amplitude waves caused when the frequency of an applied force is equal to the natural frequency of an object.
Video Examples:
Wine Glass
Rice
Ruben's Tube
Tesla Coils & More Tesla Coils
Suspension Bridge with Harmonics
Washington Tacoma Bridge & Real Explanation

14. Doppler Effect the change in frequency due to the relative
motion of the wave source and the observer
The observed frequency is higher when the
source and observer are getting closer.
The observed frequency is lower when the
source and observer are getting farther away.

15. to run simulations of the Doppler Effect.
Click here and here
to run simulations of the Doppler Effect.
The Doppler Effect
can be evident for
ALL types of waves –
including light,
sound, water, etc…

16. Big Bang Theory- Doppler Effect