1. Sound
Chapter 12

2. Sound hunt Remain as quiet as you can for 1 minute.
I will tell you when to begin, and when to stop.
In the margin of your paper, write down all of the different sounds that you hear in the environment around you.
You will be comparing with a partner at the conclusion of the activity.

3. 1. A vibration is a back and forth motion that produces sound.

4. 2. As the bell of an alarm clock vibrates, it causes nearby air particles to move.

5. 3. A wave that transfers sound through matter is a(n) sound wave.

6. 4. Sound waves transfer energy from particle to particle and move away from a vibrating object in all directions.

7. 5. Sound waves travel through solids, liquids, and gases.

8. 6. A sound that bounces off a surface and is a reflected sound, or a(n) echo.

9. 7. Sound waves travel through different materials at different speeds.

10. 8. Sound travels slowest in a gas
8. Sound travels slowest in a gas. It travels more quickly through a(n) liquid, and travels most quickly through a(n) solid.

11. 9. Dolphins use echoes to navigate and find prey.

12. 10. You hear sound when sound waves in the air make tiny organs in your ears vibrate.

13. 11. The distance from the top of one sound wave to the top of the next wave is a(n) wavelength. The number of wavelengths that pass a point in one second is called frequency.

14. 12. The highness or lowness of a sound is its pitch.

15. 13. Amplitude affects the volume, or loudness, of sound; it is related to the amount of energy in a sound wave.

16. Exit question
Do you think that there is sound in outer space? Why or Why not?