1. Wave Interactions
Ch 14
Section 3
Pages
108

2. Waves interact with other objects and waves
They can
Reflect
Refract
Diffract
Interference
What are the four things a wave can do?
108

3. Reflection
The bouncing back of a ray of light, sound or heat when the ray hits a surface that it does not go through
109

4. Law of Reflection copy this picture!!!
The angle of incidence equals the angle of reflection
The normal is a line perpendicular to the surface
109
copy this picture!!!

5. Diffraction The bending of waves around an edge
When waves pass the edge of an object or pass through an opening they spread out as if a new wave were created there
110

6. Diffraction of Sound
110
Draw only
                                                                            

7. Refraction
The bending of a wave front as it passes between two substances in which the speed of the wave differs
111
Animation courtesy of Dr. Dan Russell, Kettering University

8. Interference The combination of two or more waves May be: Constructive
Destructive
This one is constructive
112

9. Constructive Interference
The crests of two waves overlap each other
Results in a larger wave—
A + B add together
Also called in phase
Lasers use this
112

10. Shock ABSORBERS
Read page 458

11. Destructive Interference
Waves crests and troughs align and result in cancellation
Used in anti-noise technology
113

12. Interference of Light Causes colorful displays Oil slicks on sidewalks
Soap bubbles
113

13. Interference of sound produces beats
Band members listen for beats to tell if they are out of tune
108
113

14. Review