1. Electromagnetic and Mechanical Waves

2. S8P4. Students will explore the wave nature of sound and electromagnetic radiation. What does it mean? Students will study the way sound and electromagnetic radiation travel as waves.

3. a. Identify the characteristics of electromagnetic and mechanical waves. What’s does it mean? Identify to point out or pick out IIIIdentify the features of electromagnetic and mechanical waves. KKKKey Terms: wave, medium, mechanical wave, transverse wave, longitudinal wave, compression, rarefaction, electromagnetic wave

4. Resources: Coach book pp. 146-148. Coach book pp. 146-148.  Content: 1. Definition of “Key Words” on p. 146 1. Definition of “Key Words” on p. 146 2. Diagram of each type of wave 2. Diagram of each type of wave 3. Parts of each type of wave 3. Parts of each type of wave 4. Examples 4. Examples

5. Waves A wave is any disturbance that transfers energy through matter or space.

6. A pebble thrown into water causes waves to move outward from the place where the pebble entered the water. This motion is known as a disturbance. All waves are disturbances that transmit energy.

7. Medium The material through which waves can travel. Can be a gas (air), a liquid (water), or a solid.

8. Mechanical Wave A wave that needs a medium to travel. A wave that needs a medium to travel. Waves are classified according to the way they move. Waves are classified according to the way they move. 1. transverse wave 1. transverse wave 2. longitudinal wave 2. longitudinal wave

9. Transverse Wave A wave that transfers energy in a direction that is perpendicular (at a right angle) to its medium. Made up of crests (high points) and troughs (low points). Type of mechanical wave (requires a medium to travel).

10. Longitudinal Wave A wave in which particles vibrate back and forth along the path that the wave moves. A slinky is an example. Has two parts: compression and rarefaction. Sound waves are longitudinal waves

11. Compression The part of the longitudinal wave where the particles are bunched up. The part of the longitudinal wave where the particles are bunched up. It is similar to the crest of a transverse wave. It is similar to the crest of a transverse wave. compression

12. Rarefaction The part of a longitudinal wave in which the particles spread apart. The part of a longitudinal wave in which the particles spread apart. Similar to the trough of a transverse wave. Similar to the trough of a transverse wave. rarefaction

13. Electromagnetic wave Does not need a medium to transfer Does not need a medium to transfer Visible light, microwaves, ultraviolet light, x-rays, infrared waves, and gamma rays can all travel through empty space. Visible light, microwaves, ultraviolet light, x-rays, infrared waves, and gamma rays can all travel through empty space. Also known as EM waves. Also known as EM waves.