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Sound
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Study Guide
SOLs: 5.2-The student will investigate and understand how sound is transmitted and is used as a means of communication.
a) Frequency, waves, wavelength, vibration
b) Ability of different media (solids, liquids, and gasses) to transmit sound
c) Uses and applications (voice, sonar, animal sounds, and musical instruments)
1. Sound moves in _____waves_____ that are carried by ____vibrating____matter.
2. ___compression_____ -when sound moves forward and squeezes the molecules together
3. ___rarefaction_____ -when the pressure on the molecules drops
4. The ______wavelength______ of a sound is the distance between two
_____compressions_________.
5. If a sound is continuous, both compression and rarefaction are repeated again and again.
6. The _______frequency________ at which sound waves move determines the
____pitch____.
7. ___pitch____ -the highness or lowness of a sound
(often labeled with ___letters called notes__)
8. The faster the vibration, the __higher___ the pitch.
9. ___volume____ -the loudness; amount of sound
10. The more molecules squeezed together during compression, the ____louder____ the
sound is.
11. Because sound waves are ____vibrations___ of molecules, molecules must be present
for sound to travel. Where there is no matter, such as in outer space, sound
___cannot___ travel.
12. Sound waves travel through air at about ___340____m/sec.
12. The ___denser___ an object is the ___faster___ and ___further___the sound wave
will travel.
13. Sound energy travels better through most __solids__.
14. Materials that carry sound waves are called ___conductors_____.
15. Materials that don’t carry sound waves are called ______insulators_______.
16. Through which kind of matter does sound travel the slowest? Gas (air)
17. Through which kind of matter does sound travel the fastest? Solid (steel)
18. When sound waves bounce off of a hard object, it is called an ___echo____.
rarefaction
compression
More
molecules =
louder sound
wavelength