1. Chapter 20 – The Energy of Waves
Section 3 – Wave Interactions pp

2. TERMS TO LEARN
Reflection: the bouncing back of a wave after it hits a barrier
Refraction: the bending of a wave as it passes at an angle from one medium to another

3. TERMS TO LEARN
Diffraction: the bending of waves around a barrier or through an opening
Interference: a wave interaction that occurs when two or more waves overlap

4. TERMS TO LEARN
Standing wave: a wave that forms a stationary pattern in which parts of the wave do not move and other parts move with a large amplitude

5. TERMS TO LEARN
Resonance: this occurs when an object vibrating at or near a resonant frequency of a second object causes the second object to vibrate
Resonant frequency: the frequency at which standing waves are made

6. REFLECTION
The bouncing back of a wave after it strikes a barrier or an object is called reflection.
All waves can be reflected.

7. REFLECTION
When light rays from the Sun strike the surface of the moon, they are reflected which allows us to enjoy moonlit nights.

8. REFLECTION Reflected sound waves are called echoes.
Some animals use echolocation to find food or for navigation.

9. REFRACTION
The bending of a wave as it passes at an angle from one medium to another is called refraction.
The speed of a wave changes depending on the medium in which it is traveling

10. REFRACTION
When a wave moves from one medium to another, the speed of the wave changes.

11. DIFFRACTION
The bending of waves around a barrier or through an opening is called diffraction.
Most of the time waves travel in straight lines.

12. INTERFERENCE
A wave interaction that occurs when two or more waves overlap is called interference.
Interference can either be constructive or destructive.
Constructive interference increases amplitude; destructive interference decreases amplitude.

15. INTERFERENCE
Interference can create standing waves. A standing wave is a wave that forms a stationary pattern in which parts of the wave are at rest position because of total destructive interference and parts of the wave have large amplitude due to constructive inference.

16. STRING THING DEMONSTRATION

17. RESONANCE
This occurs when an object vibrating at or near the resonant frequency of a second object causes the second object to vibrate.

18. RESONANCE