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Glossary of physical science chp. 19

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sonar
a type of listening device that uses sound waves to locate objects; sound navigation and ranging
echolocation
sonar used by bats
Doppler effect
the effect of motion on sound; named in honor of the Austrian physicist Christian Doppler
beat
the destructive interference of two sound waves with slightly different frequencies and similar amplitudes
decibels (db)
the smallest difference in intensity between two sounds that the human ear is capable of detecting
waves
rhythmic disturbances that transfer energy through space or matter
sound
mechanical waves taht can often be detected by our ears
pitch
the distance between two adjacent threads on a screw; how high or low a tone sounds to an observer (related to frequency)
loudness
related to intensity; how strong or weak a sound is to an observer
ultrasonic
sound waves that are too high in frequency for the human ear to hear
threshold of hearing
the very softest sound level that can be detected by an observer
infrasonic
sound waves that are too low in frequency for the human ear to hear
resonance
the transfer of energy from one object to another object with the same natural frequency
frequency
the number of waves that pass a given point in one second
acoustics
the effect of materials and their shapes on sound
rarefaction
a region where the air molecules are spread apart by the energy of a sound wave
amplitude
the distance that a wave rises or falls from its normal rest position
compression
a region where air molecules are pushed closer together than normal by the energy of a sound wave

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