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What is acoustic propagation properties?
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The effects of the medium upon the sound wave
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Definition of sound
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A type of wave that carries energy not matter from place to place.
Created by the vibration of a moving object.
A series of compressions and rarefactions.
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What are compressions?
What are rarefactions?
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Compressions are areas of increased pressure on density.
Rarefactions are areas of decreased pressure on density.
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True or false
Sound must travel through a medium, cannot travel through a vacuum.
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True
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Sound is mechanical, _______ wave and travels in a _____ line.
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Longitudnal
straight
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Concentration of mass within a volume is called _______.
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Pressure (kg/cm3)
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Measure of particle motion is called ________.
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Distance
(cm, feet, miles)
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Definition of transverse wave.
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Particles move in a perpendicular direction (right angles or 90 degrees) to the direction of the wave.
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Particles moving in the same direction of the wave arknown as _________.
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Longitudnal waves
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Define acoustic variables.
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Identify which are sound waves, when acoustic variables change rhythmically in time, a sound wave is present.
** Acoustic variables inform us of which waves are sound waves (pressure, density, distance)
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What describes features of a particular sound wave
(period, frequency, amplitude, power, intensity, speed, & wavelength)?
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Acoustic Parameters
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Define period.
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The time required to complete a single cycle (start of a cycle to the start of the next cycle).
(secs, usec, hours, any unit of time)
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Define frequency.
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Number of certain events that occur in a particular time.The frequency of a wave is the number of cycles of an acoustic variable that occur in one second.
(per second, 1/second, Hertz, Hz)
2-15 MHz - affects penetration & axial resolution (image quality)
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Another way of saying per second is _________.
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Hertz
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A wave with a frequency exceeding 20,000 Hz (20 kHz) is known as ______.
Is this sound an audible sound?
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Ultrasound
NO, CANNOT BE HEARD BY MAN
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