1. Unit 3 Waves and Light Lesson 1 Waves
A wave is the transmission of energy through matter or empty space.
There are several kinds of waves: light, sound, ocean, micro, and radio
Waves travel from a source and move away from that source
Energy transmits through materials through vibrations. Vibrations are a back and forth motion that constantly repeats within a set of objects (particles). For instance, a vibrating particle passes its energy to a second nearby particle causing it to vibrate like itself.

2. Unit 3 Waves and Light Lesson 1 Waves
When you hear the word wave, what do you think of?

3. Unit 3 Waves and Light Lesson 1 Waves
Classification of Waves:
1. Mechanical waves: waves that need to travel through a medium (solids, liquids, or gases)
- examples would be sound (does not travel through a vacuum) and ocean waves
2. Electromagnetic waves: waves that do not need a medium in order to transmit
- examples are radiation, UV light, x-rays, gamma rays, microwaves, infrared waves, and visible light

4. Unit 3 Waves and Light Lesson 1 Waves
Types of Waves
1. Transverse waves – waves that have particles that move up and down in a perpendicular (across) direction.
-parts: crest (highest point) and trough (lowest point)
-example: electromagnetic waves

5. Unit 3 Waves and Light Lesson 1 Waves
Types of Waves (con’t)
2. Longitudinal waves – wave where particles move back and forth along the direction of the wave within a given medium
- parts: compression (crunched together) and rarefaction (spread apart)
- examples: sound waves

6. Unit 3 Waves and Light Lesson 1 Waves
Types of Waves (con’t)
3. Surface waves = move in circles: particles move forward at the crest and backwards at the trough
-parts= transverse + longitudinal waves