1. Wave Behavior

2. Reflection
Reflection- When a wave strikes an object or surface and bounces off.
Ex: Echo is reflected sound waves
Ex: Mirror reflects light waves
If smooth surface the reflected image is clear and sharp
If rough or uneven the reflected image is distorted because reflected light scatters

3. Refraction
Refraction- The bending of a wave as it moves from one medium into another
Ex: Pencil in glass of water looks like it is bending
Light waves travel faster in air than in water
Larger speed change means a bigger difference
Prisms refract light twice and separates colors (rainbow) because each color has a different wavelength
Wavelength (Decreasing)
Red (longest), Orange, Yellow, Green, Blue, Indigo, and Violet (shortest)

4. Diffraction Diffraction- Bending of waves around a barrier
Sound waves diffract much easier than light waves because they have longer wave lengths than light waves
Water does the same around barriers

5. When Waves Meet
Interference- When two waves combine and form a new wave when they overlap
After they overlap the two waves continue to travel on in their original form
Constructive interference creates larger waves (crest meets crest)
Destructive interference creates smaller waves (crest meets trough)
Waves with larger amplitudes carry more energy.
Ex: Ocean Waves
Use ear protectors to absorb some of the energy carried by sound waves