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Sound
Chapter 18 Vocabulay Terms
22
Science
7th Grade
12/02/2013

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Term
sound
Definition
form of energy that travels as waves
Term
vibration
Definition
rapid back-and-forth movement
Term
longitudinal wave
Definition
wave in which the particles of the medium move back and forth in the direction of the wave motion
Term
medium
Definition
material through which mechanical waves can travel
Term
echo
Definition
reflected sound waves
Term
supersonic
Definition
faster than the speed of sound for that medium
Term
sonic boom
Definition
loud noise caused by breaking the sound barrier
Term
intensity
Definition
amount of energy in a sound wave
Term
decibel
Definition
unit used to measure the intensity of loudness of a sound
Term
pitch
Definition
how high or low a sound is
Term
ultrasonic
Definition
sound above 20,000 Hz frequency
Term
intrasonic
Definition
sound below 20 Hz frequency
Term
timbre
Definition
sound quality
Term
fundamental tone
Definition
lowest pitched sound produced when an object vibrates
Term
overtones
Definition
sounds that have a higher pitch than the fundamental tone
Term
music
Definition
a pleasing combustion of sounds
Term
noise
Definition
unpleasant combinations of sound with irregular patterns of vibration
Term
Doppler effect
Definition
apparent change in the frequency of waves
Term
hearing
Definition
one of the five human senses
Term
ear
Definition
sense organ that detects sound
Term
eardrum
Definition
thin sheet of tissue that vibrates when sound waves strike it
Term
cochlea
Definition
organ that changes sound vibrations into nerve signals
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