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# Waves!

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### Waves!

1. 1. Waves!<br />7SCIENCE Thurs. May 5th, 2011<br />
2. 2. What are waves and how are they related to matter?<br />Waves are regular disturbances that carry energy through matter or space without carrying matter<br />Ex: when you listen to music the speakers vibrate and create sound waves that reach your ears <br />Ex: When you kick a soccer ball to a friend you are transferring energy (feel the force of the ball) as well as matter (ball)<br />
3. 3. Main Types of Waves<br />Mechanical<br />Electromagnetic <br />Transverse<br />Compressional<br />Compressional Waves<br />
4. 4. Mechanical Waves<br />Waves that require matter to carry energy are called mechanical waves<br />Ex: sound travels through air (matter) from gas molecule to gas molecule to your ears<br />Without air, you would not hear sounds<br />When we drop water into the plate, this energyis transferred from molecule to molecule of water and creates waves<br />
5. 5. Electromagnetic Waves<br />Waves that do not require matter to carry energy are called electromagnetic waves<br />Ex: radio, TV, microwave, x-rays, Sun<br />Ex: Can travel through the walls of your home and places like space <br />
6. 6. Transverse Waves<br />Mechanical transverse waves, matter moves back and forth<br />All electromagnetic waves are transverse <br />Diagram: The high part of a transverse wave is called the crest. The low part of a transverse wave is the trough. The amplitude of the wave is the distance the crest rises above or the trough falls belowthe wave’s center line. <br />Amplitude<br />
7. 7. Compressional Waves<br />Mechanical waves can be transverse or compressional<br />Compressional waves move matter forward and backward in the same direction the wave travels<br />Ex: spring toy<br />Only carries energy forward, the spring does not move along with the wave<br />Ex: Sound waves are compressional waves<br />
8. 8. Sound Waves<br />How do we make sound waves? Ex: drum<br />When a drum is not being played the air particles are spread the same distance apart<br />When the drum is hit, the surface moves down and the air particles move away from each other<br />When the drum’s surface moves back up, the air particles are squeezed together<br />The air particles transfer the sound energy through the air and to your ear<br />