SUS1501 EXAM SCRIPT VERIFIED
QUESTIONS AND SOLUTIONS COMPLETE
REVIEW MATERIAL
●● Absorption
Answer: Conversion of sound energy to heat.
●● Acoustic variables
Answer: Changes within the medium due to sound travelling through
that medium. Includes pressure, density, and particle motion.
●● Amplitude
Answer: Maximum deviation of an acoustic variable from the average
value of that variable. Includes pressure, density, and particle motion.
●● Attenuation
Answer: A decrease in amplitude and intensity of a sound beam as it
travels.
●● Attenuation coefficient
Answer: The rate at which sound is attenuated per unit depth.
,●● Beam uniformity coefficient
Answer: The ratio of the center intensity to the average spatial intensity
of the beam.
-AKA: SP/SA factor
●● Capacitive micromachined ultrasound transducers
Answer: Technology used to create comparable transducer technology to
piezoelectric materials.
●● Damping
Answer: Reducing the number of cycles of each pulse to improve axial
resolution.
●● Decibels
Answer: Unit that establishes a relationship or comparison between two
values of power, intensity, or amplitude.
●● Frequency
Answer: Number of cycles per second (Hz)
●● Half intensity depth (HID)
Answer: Depth at which sound has lost half of its intensity.
-AKA: half value layer thickness
,●● Hydrophone
Answer: A device used to measure the output intensity of the transducer.
●● Impedance
Answer: Resistance to propagation of sound through a medium.
Unit: Rayls
●● Intensity
Answer: Power or energy per unit area.
Unit: W/cm^2
●● Intensity reflection coefficient
Answer: Percentage of sound reflected at an interface.
●● Intensity transmission coefficient
Answer: Percentage of sound transmitted at an interface.
●● Medium
, Answer: Any form of matter through which sound can travel (solid,
liquid, gas).
●● Nonspecular reflectors
Answer: Reflectors that are smaller than the wavelength of the incident
beam.
●● Normal incidence
Answer: Angle of incidence is 90 degrees to the interface.
●● Oblique incidence
Answer: Angle of incidence is less than or greater than 90 degrees to the
interface.
●● Parameter
Answer: A measurable quantity.
●● Path length
Answer: Distance to the reflector.
●● Period
Answer: Time it takes for one cycle to occur.
QUESTIONS AND SOLUTIONS COMPLETE
REVIEW MATERIAL
●● Absorption
Answer: Conversion of sound energy to heat.
●● Acoustic variables
Answer: Changes within the medium due to sound travelling through
that medium. Includes pressure, density, and particle motion.
●● Amplitude
Answer: Maximum deviation of an acoustic variable from the average
value of that variable. Includes pressure, density, and particle motion.
●● Attenuation
Answer: A decrease in amplitude and intensity of a sound beam as it
travels.
●● Attenuation coefficient
Answer: The rate at which sound is attenuated per unit depth.
,●● Beam uniformity coefficient
Answer: The ratio of the center intensity to the average spatial intensity
of the beam.
-AKA: SP/SA factor
●● Capacitive micromachined ultrasound transducers
Answer: Technology used to create comparable transducer technology to
piezoelectric materials.
●● Damping
Answer: Reducing the number of cycles of each pulse to improve axial
resolution.
●● Decibels
Answer: Unit that establishes a relationship or comparison between two
values of power, intensity, or amplitude.
●● Frequency
Answer: Number of cycles per second (Hz)
●● Half intensity depth (HID)
Answer: Depth at which sound has lost half of its intensity.
-AKA: half value layer thickness
,●● Hydrophone
Answer: A device used to measure the output intensity of the transducer.
●● Impedance
Answer: Resistance to propagation of sound through a medium.
Unit: Rayls
●● Intensity
Answer: Power or energy per unit area.
Unit: W/cm^2
●● Intensity reflection coefficient
Answer: Percentage of sound reflected at an interface.
●● Intensity transmission coefficient
Answer: Percentage of sound transmitted at an interface.
●● Medium
, Answer: Any form of matter through which sound can travel (solid,
liquid, gas).
●● Nonspecular reflectors
Answer: Reflectors that are smaller than the wavelength of the incident
beam.
●● Normal incidence
Answer: Angle of incidence is 90 degrees to the interface.
●● Oblique incidence
Answer: Angle of incidence is less than or greater than 90 degrees to the
interface.
●● Parameter
Answer: A measurable quantity.
●● Path length
Answer: Distance to the reflector.
●● Period
Answer: Time it takes for one cycle to occur.
