Page 1 of 253
Davies Ultrasound Physics exam study
guide ALL 500 QUESTIONS AND
VERIFIED SOLUTIONS LATEST
UPDATE THIS YEAR
Which of the following statements are true regarding the effect of frequency on Rayleigh
scattering is true?
a. the amount of scattering is not affected by frequency
b. scattering intensity doubles if frequency is doubled
c. doubling the frequency results in halving the scattering intensity
d. doubling the frequency results in quartering the scattering intensity
e. scattering intensity is proportional to frequency raised to the fourth power
scattering intensity is proportional to frequency raised to the fourth power
An echo from which one of the following sound reflectors is most dependent on the angle of
incidence?
A: Rayleigh scatterer
B: Diffuse reflector
C: Specular reflector
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D: Acoustic scatterer
E: Nonspecular reflector
specular reflector
According to Snell's law the angle of transmission is related to the incident beam angle and:
A: The amount of acoustic impedance mismatch at an interface.
B: The change in frequency that occurs at an interface.
C: One-half of the angle of incidence.
D: The relative speeds of sound in the two media.
E: The percentage of diffraction distal to the interface.
the relative speeds of sound in the two media
What is the relationship of frequency to absorption?
if frequency is doubled, absorption is doubled
Another term for nonspecular reflection is
scattering
While performing a sonographic exam, you encounter the following interfaces. Which will
produce the weakest reflected signal?
a. organ parenchyma/fluid
b. organ parenchyma/air
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c. organ parenchyma/organ parenchyma
d. organ parenchyma/bone
e. organ parenchyma/ligament
organ parenchyma/organ parenchyma
Which prefix equals 10^-3
milli
When you switch from a 2.5 MHz to a 5.0 MHz transducer, the sound wavelength
halves
The propagation speed for sound is lowest in which of the following biologic tissues?
a. fat
b. blood
c. muscles
d. bone
e. liver
fat
An example of a specular reflector is
a. pericardium
b. liver parenchyma
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, Page 4 of 253
c. red blood cells
d. ascites
e. hematoma
pericardium
Which phenomenon is associated with a pattern produced by a sound beam after passing
through a small aperture?
A: Scattering
B: Absorption
C: Diffraction
D: Interference
E: Diffuse reflection
diffraction
As a general observation about media in diagnostic sonography sound propagates faster in
materials with greater:
A: Compressibility
B: Acoustic impedance
C: Stiffness
D: Refractive index
E: All of the above
stiffness
4
Davies Ultrasound Physics exam study
guide ALL 500 QUESTIONS AND
VERIFIED SOLUTIONS LATEST
UPDATE THIS YEAR
Which of the following statements are true regarding the effect of frequency on Rayleigh
scattering is true?
a. the amount of scattering is not affected by frequency
b. scattering intensity doubles if frequency is doubled
c. doubling the frequency results in halving the scattering intensity
d. doubling the frequency results in quartering the scattering intensity
e. scattering intensity is proportional to frequency raised to the fourth power
scattering intensity is proportional to frequency raised to the fourth power
An echo from which one of the following sound reflectors is most dependent on the angle of
incidence?
A: Rayleigh scatterer
B: Diffuse reflector
C: Specular reflector
1
, Page 2 of 253
D: Acoustic scatterer
E: Nonspecular reflector
specular reflector
According to Snell's law the angle of transmission is related to the incident beam angle and:
A: The amount of acoustic impedance mismatch at an interface.
B: The change in frequency that occurs at an interface.
C: One-half of the angle of incidence.
D: The relative speeds of sound in the two media.
E: The percentage of diffraction distal to the interface.
the relative speeds of sound in the two media
What is the relationship of frequency to absorption?
if frequency is doubled, absorption is doubled
Another term for nonspecular reflection is
scattering
While performing a sonographic exam, you encounter the following interfaces. Which will
produce the weakest reflected signal?
a. organ parenchyma/fluid
b. organ parenchyma/air
2
, Page 3 of 253
c. organ parenchyma/organ parenchyma
d. organ parenchyma/bone
e. organ parenchyma/ligament
organ parenchyma/organ parenchyma
Which prefix equals 10^-3
milli
When you switch from a 2.5 MHz to a 5.0 MHz transducer, the sound wavelength
halves
The propagation speed for sound is lowest in which of the following biologic tissues?
a. fat
b. blood
c. muscles
d. bone
e. liver
fat
An example of a specular reflector is
a. pericardium
b. liver parenchyma
3
, Page 4 of 253
c. red blood cells
d. ascites
e. hematoma
pericardium
Which phenomenon is associated with a pattern produced by a sound beam after passing
through a small aperture?
A: Scattering
B: Absorption
C: Diffraction
D: Interference
E: Diffuse reflection
diffraction
As a general observation about media in diagnostic sonography sound propagates faster in
materials with greater:
A: Compressibility
B: Acoustic impedance
C: Stiffness
D: Refractive index
E: All of the above
stiffness
4
