When the direction of the wave propagation is parallel to the particle motion of the medium, the
wave being transmitted is called a:
A) surface wave.
B) longitudinal wave.
C) transverse wave.
D) non-linear sound. - answer✔✔B) longitudinal wave
If the sound beam attenuated 6 dB, what will happen to the overall intensity?
A) Quadrupled
B) Doubled
C) Halved
D) Quartered - answer✔✔D) Quartered
Frequency increased from 3 MHz to 6 MHz, what will happen to wavelength?
A) Doubled
B) Quadrupled
C) Halved
D) Quartered - answer✔✔C) Halved
Intensity is equal to:
A) power/area
B) propagation speed/frequency
C) density x propagation speed
5. What is important when selecting a transducer frequency?
A) Depth
B) Power
C) Velocity
D) Propagation speed - answer✔✔A) Depth
6. Frequency is a factor in:
A) impedance
B) tissue attenuation
C) propagation speed
D) tissue density - answer✔✔B) tissue attenuation
7. Which medium interface will have the greatest sound transmission?
A) Soft tissue to water
B) Organ to organ
C) Bone to organ
D) Lung to soft tissue - answer✔✔B) Organ to organ
8. If there is a small impedance mismatch between two mediums, what will result?
A) There will be a small reflection
B) There will be a large reflection
C) All sound will transmit
D) No sound will transmit - answer✔✔A) There will be a small reflection
9. Which property of sound is measured in Rayls?
A) Intensity
B) Impedance
C) Density
D) Propagation speed - answer✔✔B) Impedance
10. If sound energy is reduced by 50%, how many decibels were lost?
A) 6 dB
D) 10 dB - answer✔✔B) 3 dB
11. To improve the quality of the motion during an electrocardiogram, which resolution should
be improved?
A) Transverse resolution
B) Lateral resolution
C) Axial resolution
D) Temporal resolution - answer✔✔D) Temporal resolution
12. Ultrasound frequency begins at:
A) 2 Hz
B) 20 Hz
C) 20 Mhz
D) 20 kHz - answer✔✔D) 20 kHz
13. An increase in which property will increase the propagation speed?
A) Period
B) Bulk modulus
C) Frequency
D) Intensity - answer✔✔B) Bulk modulus (stiffness)
14. A technician is using a 6 MHz transducer at a depth of 4cm, what is the attenuation
coefficient?
A) 1/2 dB/cm
B) 8 dB/cm
C) 6 dB/cm
D) 3 dB/cm - answer✔✔D) 3 dB/cm
15. Which reflector type requires a specific angle for optimal imaging?
A) Diffuse
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