1. Waves, Sound, and Light

2. Key Ideas
I will understand the relationship among waves, energy and matter.
I will be able to describe the difference between transverse waves and compressional waves.

3. Vocab Words ( You will need to know these to be successful in 8th Grade and High School)
Wave
Transverse Wave
Electromagnetic Wave
Mechanical Wave
Compressional Wave

4. So, what exactly is a wave?
In your own words, write down what you
think waves are here. Give it a shot and see how you do…. NO DON’T ASK ANYONE ELSE!!!! You are on your own!!!

5. Rhythmic disturbances that carry energy without carrying matter are called waves.
What is energy?
Ability to do work.
Work: movement of an object over a distance.
The energy (of the people standing up) is transferred
around the stadium, but the people themselves do not move very far
at all.

6. Molecules transport wave energy without themselves moving, like a line of people passing a ball.

7. Mechanical waves use matter to transfer energy.
Transverse Wave –
wave enegy causes
matter in the medium to
move up and down or
back and forth at right
to the wave angles

8. Example of mediums: Gases – Air Liquids – Water Solids – slinky
Medium - is a surrounding or enveloping substance.
Example of mediums:
Gases – Air
Liquids – Water
Solids – slinky

9. What is the medium in the picture below?
Compressional waves – Matter in the medium
moves forward and backward in the
same direction as the wave
What is the medium in the picture below?

10. Sound Waves – Compressional waves caused by colliding air molecules.
Electromagnetic Waves –
Transfer energy without
transferring matter;
produced by electrically
charged particles.

11. Whiteboard Time 1) What are the different types of waves?
3) Draw a compressional wave
4) What is a medium. List 3 examples of mediums
5) Can a transverse wave be found in space?
2) Draw a transverse wave