1. Jane Wahl Kim Vredenburg November, 2001
Sounds Good to Me!
Jane Wahl
Kim Vredenburg
November, 2001

2. What Is Sound?
Sound is vibrations that you can hear

3. Sound Depends On: A vibrating source to set up the sound waves
A medium to carry the waves
A receiver to detect them

4. Vibrations Back-and-forth movement of matter or particles of matter
Sound travels away from the vibrating object in all directions

5. Sound Waves Sound travels through matter as sound waves
Particles of air are pushed together and then pulled apart
Compressions are where particles are pushed together

6. Volume Amount of sound energy reaching your ears Depends on:
How far the vibrating object is moving as it goes back and forth
How far you are from the source of a sound
Volume Control

7. Pitch How high or low a sound is
Remember: The sky is high; the roots are low
Depends on how fast the source of the sound is vibrating
To change the pitch:
Change the length of the material vibrating
Change the thickness of the material vibrating

8. Sound Travels at Different Speeds Through Different Materials
Feet per second

9. Which Would Be the Best Conductor?
Solid?
Liquid?
Gas?
Solid – The Bricks!

10. Reflection vs. Absorption
Just like light waves, sound waves can be reflected or absorbed
Sound waves reflect straight from a smooth, flat surface
There is a clear echo
Sound waves are reflected in many directions from a rough, uneven surface
There is no clear echo

11. Your Instrument Should be: Well designed Simple Functional Attractive
Creative
You must be able to:
Produce Sound
Change Pitch
Change Volume