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| areas where sound is dense |
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| areas where sound is less dense |
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| what is the number of Hz of infrasound |
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| what is the number of Hz for audible sound |
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| what is the number of Hz for ultrasound |
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| what are the Hz of diagnostic medical ultrasound |
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| what is the average speed of sound in soft tissue |
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| what is the equation to find decibels |
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| What is the unit of mass/weight |
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| what is the unit of length |
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| what is the unit for volume |
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| what unit is energy measured in |
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| what is power and what unit is it measured in? |
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| rate of energy transport, joules/second |
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| How is intensity measured |
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| What is the formula to find decibels? |
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| since ultrasound has no reference intensity, what replaces the reference intensity |
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| Every time the intensity _____ the decibels go up by _____. |
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| What is the velocity of a wave in soft tissues? |
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| What is the relationship of velocity to frequency and wavelength? |
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| velocity is equal to the frequency multiplied by the wavelength |
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| What is the relationship of frequency to period? |
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| frequency is equal to 1/period and vice versa |
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| In what unit is Hertz measured and what is it a measure of? |
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| the per second and frequency |
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| What units are used to measure period? |
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| the time it takes to complete one cycle |
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| the number of oscillations per second |
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| the distance traveled in one cycle |
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| the measure of compressibility |
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| converts one form of energy into another with a known fixed relationship between input and output energies |
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| what is the piazoelectric effect |
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| when a mechanical force is applied to the face of the crystal and an electrical signal is generated |
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| the temperature above which the crystal loses its piazoelectric capabilities |
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| What is true when the most efficient operation of the transducer crystal is achieved? |
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| the thickness of the crystal is 1/2 the wavelength |
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| what dampens the crystal vibrations and minimizes reflected sound waves from air between itself and the crystal |
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| what is acoustic impedence |
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| when there is an interface of two tissues where the acoustic impedence differs. a fraction of the wave will be reflected |
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| How is the acoustic impedence measured (Z) |
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| what is the equation to find the amplitude reflection coefficient: (R) |
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| a mechanical energy or disturbance that moves a pressure wave through a medium |
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