1. Sound

2. I. What is Sound? A. The energy from a _______ carried in a wave.
1. ALL sounds begin with a vibration…
Vibrating Strings
Vibrating Voice
Vibrating Ear Buds
Vibrating Chirp

3. Non-Vibrating Tuning Fork
2. The vibration pushes on the surrounding air molecules
a. This area is called a “_________________”
b. The spread out area after the compression is
called a “______________.”
Non-Vibrating Tuning Fork
compression
Compressions
rarefaction
Rarefactions

5. II. Characteristics of Sound
A. Sound waves have a wavelength
1. __________ = distance between compressions
1-wave

6. High Frequency Clarinet
B. Sound frequency (waves per second) affects the pitch
1. Long Wavelength ___ frequency
Low pitch
2. Short Wavelength ____ frequency
High pitch
Low Frequency Tuba
High Frequency Clarinet

7. Material Dry Air 343 767 Water 1,483 3317 Glass 5,640 12,616 Steel
C. Sound is FAST!
1. How Fast Is It?
a. That depends on what it’s travelling through
Material
Speed (m/s)
Speed (mi/hr)
Dry Air
343
767
Water
1,483
3317
Glass
5,640
12,616
Steel
5,940
13,287
Speed (mi/s)
0.2
0.9
3.5
3.7
b. Sound is faster through _____ air than ____ air because the air molecules are moving faster.