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23 Cards in this Set
- Front
- Back
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The audible range of sound is
a. <20 Hz b.>20Hz but <20,000Hz c. >20,000but < 1MHz d. 1 MHZ-20 MHZ |
B
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Transducer frequency is directly proportional to:
a. period b.wavelength c. sound intensity d. spatial pulse length |
C
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The trm used to describe the number of cycles that occur in a one-second time period is:
a. lambda b. frequency c. wavelength d. period |
B
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Which is not considered and acoustic variable?
a. pressure b. particle motion c. intensity d. density |
C
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what 2 characteristics of a medium dtermine it's propagation speed?
a. density & temp b. stiffness & pressure c. density & stiffness d. prop speed is not affected by the medium |
A, C, D
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If the density of the medium increases, the speed of sound will:
a. increase b. decrease c. not change |
D
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If the intensity of a signal is doubled, what is the affect on amplitude:
a. halved b. quadrupled c. doubled d. squared |
B
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The rate at which work is done referred to as:
a. pressure b. intensity c. power d. amplitude |
C
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Which statement is most correct about power?
a. rate of work b. is expressed as mW/cm 2 c. power and intensity are always the same d. power is = to the transfer of energy |
A
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The percentage of time the sound is on is referred to as the
a. intensity b. amplitude c. period d. duty Factor |
D
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A 6dB gain would indicate an increase in intensity of
a. 2 b. 4 c. 8 d. 10 |
B
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The log of 10,000 is equal to:
a. 2 b. 3 c. 4 d. 5 |
C
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Which statement about intensity is most correct:
a. intensity is proportional to amplitude b. intensity is uniform over the beam area c. intensity depends upon both power and beam area d. intensity varies as it travels, creating 5 multiple intensities |
C
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If the initail is 40 and there is a 3dB gain the final intensity is:
a. 80 b. 60 c. 40 d. 20 |
A
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The speed of sound in tissue is:
a. 1.54 mm/us b. 1540 mm/sec c. 1.54 kilo/sec d. all of the above |
A
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Wavelength is detrmined by which factors:
a. sound source b. medium c. power d. a and c e. a and b |
E
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If the stiffness of a medium increases, the prop speed will:
a. increase b. decrease c. reamin constant |
A
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Propagation speed is higher through:
a. lung b. blood c. liver d. bone |
D
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A complete cycle consists of one aompression and one rarefaction. The area of low pressure and density is :
a. compression b. raefaction |
B
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Period and frequency are:
a. inversely proportional b. directly proportional c. have no impact on each other |
A
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At one half intensity depth:
a. the initial intensity equals zero b. we are in the inatruments focal zone c. the intial intensity was halved d. beam divergence is minimum |
C
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As U/S wave travels through the body, its intensity usually:
a. increases b. decreases c. remains the same |
B
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Which of the folloqing intensities would be the greatest for a pulsed beam of sound?
a. SATA b. SPTA c. SPTP d. SATP |
C
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