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