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Unit 8 Vocab

Important vocab to know from the sound unit

TermDefinition
pitch the highness or lowness of a note; depends on sound wave frequency
frequency how often a wave passes a certain point in a second; this determines sound wave pitch
intensity related to the loudness of sound; depends on sound wave amplitude
amplitude a measure of the amount of energy carried by a sound wave; this determines sound wave intensity
decibel the unit which intensity is measured in
the decibel scale this is not linear; it says that every time a sound intensity increases by 20 decibels, a sound seems to be twice as loud
harmful range this is the range of intensities greater than 120 dB
audible range this is the range of intensities from 0 dB to 120 dB; it is also the name for the range of pitches from 20 Hz to 20,000 Hz
sub-audible range this is the range of all intensities that are lower than 0 dB--these cannot be heard by humans
subsonic range this is the range of all pitches that are lower than 20 Hz; these cannot be heard by humans
ultrasonic range this is the range of all pitches that are greater than 20,000 Hz; these cannot be heard by humans
consonance any combination of different frequencies that sounds "good" together; this is because the frequencies are either far apart, or they are even multiples of each other
dissonance any combination of different frequencies that sounds "bad" together; this is because the frequencies are close together, so they interfere to create an unpleasant sound
harmonics frequencies that are multiples of a fundamental note; many of these make up how instruments sound when they play "one note"
cochlea the part of the inner ear that is lined with tiny hairs that transmit sound waves to the brain
stereocilia tiny hairs that line the cochlea in the inner ear; they transmit sound waves to the brain
speed of sound this describe how quickly a sound wave moves and it depends on the medium the sound is traveling through
sound this is caused by vibrations of a object vibrating air molecules which then vibrate a person's ear drum, which causes them to hear
doppler effect this explains why sound coming closer seems to increase in pitch, while sound going farther away seems to decrease in pitch
supersonic speed any speed over the speed of sound
music this is a combination of frequencies that fits some pattern
noise this is a random combination of frequencies that makes no pattern
ear drum this is the part of the ear that sound vibration hit initially
mechanical wave this type of wave requires a medium to move through; sound is this type
longitudinal wave this type of wave includes parts called compressions and rarefactions; sound is this type
Created by: davenportscience