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40 Cards in this Set
- Front
- Back
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amplitude
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the extent of displacement from the equilibrium condition; the size of a wave from the rest (equilibrium) position.
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beats
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rhythmic increases and decreases of volume from constructive and destructive interference between two sound waves of slightly different frequencies
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condensation
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(sound) a compression of gas molecules; a pulse of increased density and pressure that moves through the air at the speed of sound
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CYCLE
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a complete vibration
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decibel scale
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a non linear scale of loudess based on the ratio of the intensity level of a sound to the intensity at the threshold of hearing
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Doppler effect
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an apparent shift in the frequency of sound or light due to relative motion between the source of the sound of light and the observer
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echo
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a reflected sound that can be distinguishd from the original sound, which usually arrives 0.1 s or more after the original sound
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frequency
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the number of cycles of a vibration or or a wave occurring in one second, measured in units of cycles per second (hertz)
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fundamental frequency
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the lowest frequency (longest wavelength) that can set up standing waves in an air column or on a string
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hertz
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unit of frequency; equivalent to one cycle per second
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infrasonic
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sound waves having too low a freuency to be heard by the huan ear' sound having a grequency of less than 20 Hz
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intensity
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a measure of the energy carried by a wave
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longitudinal wave
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a mechanical disturbance that causes particles to move closer toegether and farther apart in the same direction that the wave is traveling
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natural frequency
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the frequency of vibration of an elastic object that depends on the size, composition and shape of the object
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period
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(wave) the time required for one complete cycle of a wave
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pitch
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the frequency of a sound wave
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rarefaction
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a thinning or pulse of decreased density and pressure of gas molecules
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infrasonic
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sound waves having too low a freuency to be heard by the huan ear' sound having a grequency of less than 20 Hz
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resonance
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when the frequency of an external force matches the natural frequency of a material and standing waves are set up
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reverberation
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apparent increase in volume caused by reflections, usually ariving within .1 second after the original sound
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intensity
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a measure of the energy carried by a wave
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sonic boon
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sound waves that pile up into a shock wave when a source is traveling at or faster than the speed of sound
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longitudinal wave
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a mechanical disturbance that causes particles to move closer toegether and farther apart in the same direction that the wave is traveling
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natural frequency
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the frequency of vibration of an elastic object that depends on the size, composition and shape of the object
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period
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(wave) the time required for one complete cycle of a wave
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pitch
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the frequency of a sound wave
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rarefaction
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a thinning or pulse of decreased density and pressure of gas molecules
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Doppler effect
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an apparent shift in the frequency of sound or light due to relative motion between the source of the sound of light and the observer
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resonance
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when the frequency of an external force matches the natural frequency of a material and standing waves are set up
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echo
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a reflected sound that can be distinguishd from the original sound, which usually arrives 0.1 s or more after the original sound
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reverberation
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apparent increase in volume caused by reflections, usually ariving within .1 second after the original sound
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frequency
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the number of cycles of a vibration or or a wave occurring in one second, measured in units of cycles per second (hertz)
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fundamental frequency
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the lowest frequency (longest wavelength) that can set up standing waves in an air column or on a string
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sonic boon
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sound waves that pile up into a shock wave when a source is traveling at or faster than the speed of sound
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hertz
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unit of frequency; equivalent to one cycle per second
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standing waves
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condition where two waves of equal frequency traveling in opposite directions meet and form stationary regions of maximum displacement due to regions of zero displacement due to destructive interference
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transverse wave
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a mechanical disturbance that causes particles to move perpendicular to the direction that the wave is traveling
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ultrasonic
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sound waves too high in frequency to be heard by the human ear; frequencies above 20,000 Hz
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vibration
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a back and forth motion that repeats itself
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wavelength
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the horizontal distance between successive wave crests or other successive parts of the wave
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