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29 Cards in this Set
- Front
- Back
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What is the relationship of force and period?
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Reciprocal
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If particle displacement is parallel to wave propagation, the wave is called _______.
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longitudinal
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The standard meter is _____.
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the distance light travels in a vacuum in 1/300,000,000 second.
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The average velocity of sound in soft tissue is:
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1540 m/sec
154000 cm/sec 1.54 mm/nanosec |
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What equation describes wavelength, f and c?
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Wavelength = c/f
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Wavelength of a sound wave is determined by the ______.
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source and medium
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What is NOT an appropriate measure of pressure?
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Newton, Newton is for force NOT pressure.
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What is acoustic intensity?
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power per unit area of a sound beam
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Transducer frequency is dependent of ____.
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source of sound
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What is an electromagnetic wave?
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heat, x-ray, light
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What unit of density is used in metric?
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kg/m3, g/cm3, g/ml
density = mass/volume |
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The range of frequency used in clinical ultrasound is _____.
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2-15 MHz
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What are acoustic variables?
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Pressure, Density, Temperature, Particle Motion (distance)
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Period of a soundwave is determined by the _____.
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source
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What is NOT an acoustic variable?
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amplitude
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What is the boiling point of water in F?
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212
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All waves transfer _____ through cyclic waves.
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energy
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What kind of wave needs a medium?
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mechanical
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What will NOT result in a change of wavelength?
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amplitude
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Propagation speed of sound is determined by the ______ only.
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medium
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True or False: Sound waves travel in a vacuum.
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False
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True or False: Peak to peak amplitude equals two times the amplitude.
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True
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True or False: For a given medium, the frequency will half if wavelength doubles.
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True
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True or False: Ultrasound intensity remains constant as sound travels through tissues.
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False
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True or False: When higher frequencies are used, greater penetration is achieved.
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False
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True or False: Power is proportional to intensity squared.
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False
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True or False: If amplitude is halfed, power will be quartered.
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True
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True or False: Wavelength can not be changed by a sonographer when using a certain frequency.
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True
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True or False: If a final intensity is less than input intensity, then the change of decibel is increased.
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False
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