Presentation on theme: "Unit 3 Waves and Light Lesson 1 Waves"— Presentation transcript:
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 radioWaves travel from a source and move away from that sourceEnergy 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 waves2. 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 Waves1. 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