1. Wave Interaction

2. All are transmitting/carrying ENERGY, not matter
What is a Medium??
A medium is the substance that the wave is traveling through
Examples: a wave could be traveling through water, air, solid earth, etc.
Sound travels through air
Waves in the ocean travel through water
Waves produced by an earthquake travel through solid earth
All are transmitting/carrying ENERGY, not matter

3. Reflection: waves bouncing back toward original source
A mirror image is light waves reflecting (why we call it your reflection)
An echo is sound wave reflecting back

4. Refraction: Waves bending
prisms bend light differently according to wavelength
Happens when waves change mediums (water to air)
Refraction coefficient (math way to figure out bending angle)

5. Amount of diffraction depends on wavelength
Diffraction: the bending of waves around a barrier or through an opening
This is why you hear sound (music, voices, etc.) even when you are in another room-sound waves (long wavelength) are able to diffract around corners
Amount of diffraction depends on wavelength

6. Scattering: an interaction of light with matter that causes light to change direction
amount of scattering depends on wavelength (light with shorter wavelength scatters more)
Scattering is what makes the sky blue
Blue light has a very short wavelength so it is scattered more than any other color

7. Real-World Application
On page 9 in packet At your station: picture # Type of interaction (reflection, refraction, diffraction, or scattering?) Type of wave (light, sound, water?) 1 piece of evidence…how did you know it was reflection?