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ch.16 SOUND vocab.

TermsDefinition
Echo a reflected sound wave. (sound waves reflect off objects, diffract through narrow openings and around barriers, and interfere with each other.)
Elasticity the ability of a material to bounce back after being disturbed. t(he speed of sound depends in the elasticity, density, and temperature of the medium the sound travels through.)
Density how much matter, mass, there is in a given amount of space, or volume. (The denser the medium, the more mass it has in a given volume.)
Loudness describes your perception of the energy of a sound. (The loudness of a sound depends on two factors: the amount of energy it takes to make the sound and the distance from the source of the sound.)
Intensity The amount of energy a sound wave carries per second through a unit area. (A sound wave of greater intensity sounds louder but as you move away from a sound source, loudness decreases because the intensity decreases.)
Decibel (db) the loudness of different sounds is compared using a unit.
Pitch a description of how high or low the sound seems to a person. (the pitch of a sound you here depends on the frequency of the sound wave)
ultrasound sound waves with frequencies above the normal human range of hearing.
infrasound sound with frequencies below the human rage of hearing.
larynx two folds tissue that make up the human voice box,
Doppler effect the change in frequency of a wave as it source moves in relation to an observer
what causes the Doppler effect? when a sound source moves, the frequency of the waves changes because the motion of the source adds to the motion of the waves.
what causes the sonic boom? a shock wave forms as the sound waves overlaps. (the shock wave releases a huge amount of energy. people nearby hear a loud noise the 'sonic boom' when the shock wave passes by them.)
Fudamental Tone the lowest natural frequency of anobject. (a standind wave can occur only at specific frequencies that are called natural frequencies.)
overtone the objects higher natural frequency .( overtones have frequencies that are two, three, or more times the frequency of the dudamental tone.
acoustics the study of how sounds interact with each other and the eviroment.
reverberation the echos of a sound that are heard after a sound source stops producing sound waves.
ear canal it collects sound waves and directs them into a narrow region.( your ear canal is a few cenemiters long and ends at the eardrumb.)
eardrum a small, tighty streched, drumlike membrance.( the sound waves make your erdrum virbrat, just as a drum vibrates when you strike it.)
cochlea a fluid- filled cavity shaped like a snail shell.( it contains more then 100,000 tiny structures called hair cells.)
echolocation the use of reflected sound waves to determine distances or to locate objects.
sonar a system thnat uses reflected sound waves to detect and locate objects underwate.
sonogram the device uses the reflected ultrasound waves to creat a picture.
Created by: ka.r.la