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Chapter 3
Sound
13
Science
6th Grade
10/25/2010

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Term
Compression
Definition
The part of the sound vibration pattern with bunched-up particles.
Term
Rarefaction
Definition
The part of the sound vibration pattern with spread-out particles.
Term
Medium
Definition
Any solid, liquid, or gas that carries the pattern of sound.
Term
Frequency
Definition
The number of times an object vibrates in one second.
Term
Hertz
Definition
A frequency of one vibration per second or one cycle per second.
Term
Decibel
Definition
unit of relateive loudness
Term
Pitch
Definition
The highness or lowness of the sound you hear.
Term
Cycle
Definition
a sequence of events that is repeated again and again, especially a casual sequence
Term
Noise
Definition
Sounds which produce unorganized patterns of vibrations.
Term
Resonance
Definition
The tendency for an object to vibrate at the same frequency as another sound source.
Term
Vacuum
Definition
Term
Music
Definition
Sounds that generally produce organized vibration patterns.
Term
Reticular Activating System (RAS)
Definition
An area of the human brain that sorts out all the information provided by the senses. This regulates a person's level of awareness by screening messages from the senses and passes on only the important or unusual ones.
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