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Cards In This Set
| Front | Back |
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T or F
The intensity is equal to the power divided by the cross sectional area of the beam. |
True
I = P/area |
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Which of the following is incorrect?
A. P = amplitude² B. I = amplitude² C. P = I x area D. I = P x area E. I = P / area |
D
I = P / cross sectional area of the beam |
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T or F
The velocity of ultrasound is indirectly proportional to the square root of the density of the medium. Assume the compressibility does not affect the density. |
True
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T or F
The velocity of the ultrasound is directly proportional to compressibility. Assume the density is unaffected by compressibility. |
False
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T or F
To transfer sound through a medium, the affected molecules move from one end of the medium to the other. |
Falsemicrons only
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T or F
Ultrasound waves in soft tissue are transverse waves. |
False
longitudinal wave |
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T or F
wavelength is the distance for the wave to complete one cycle. |
True
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T or F
Frequency is the number of cycles passing a given point each second. |
True
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T or F
non specular reflectors have physical dimensions that are greater than the wavelength |
False
they're smaller |
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T or F
the intensity of the ultrasound beam is proportional to the square of the acoustic pressure |
True
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T or F
if the thickness of two materials forming the interface is increased, the percentage of the reflected ultrasound wave becomes greater. |
False
reflection, normal incidence and Z (acoustic impedance) |
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For refraction to occur, the velocity of sound must change between one medium and another
|
True
bending towards (V1>V2)bending away (V1, V2) |
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The period of the wave is inversely proportional to the wavelength
|
False
reciprocal |
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T or F
the unit for Rayl is kg/m2-s |
True
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T or F
the reflection coefficient for intensity is defined as:Z2 + Z1 / Z2-Z1 |
False
- / + then squared |
