DMS 100 Final Exam 2026 – Introduction to Diagnostic Medical Sonography
Comprehensive Study Guide & Review
Sound waves sent out of a - correct answer ✔✔ Transducer
Infrasound is sound with a frequency of - correct answer ✔✔ < 20 Hertz
Audible sound is sound with a frequency of - correct answer ✔✔ 20-20,000 Hertz
Ultrasound is sound with a frequency of - correct answer ✔✔ > 20,000 Hertz
Ultrasound frequencies used for DMS classes - correct answer ✔✔ 1-15 MHz range
One cycle per second - correct answer ✔✔ Hertz (Hz)
Oscillation or vibration - correct answer ✔✔ Cycle
Kilohertz = __________ Hz - correct answer ✔✔ 1000
Megahertz = ___________ Hz - correct answer ✔✔ 1,000,000
Distance traveled by one cycle - correct answer ✔✔ Wavelength
Higher frequencies have __________ wavelengths and are attenuated _____________ - correct
answer ✔✔ smaller, easier
, Lower frequencies have ___________ wavelengths and are are attenuated ____________ -
correct answer ✔✔ longer, less easy
The reduction is the amplitude and intensity of a sound wave as it propagates through a
medium - correct answer ✔✔ Attenuation
What causes attenuation - correct answer ✔✔ Absorption, scattering, and reflection
Sound waves travel through matter by causing _____________ - correct answer ✔✔ vibrations
along the path
Another name for traveling through matter - correct answer ✔✔ propagate
High part of a wave - correct answer ✔✔ compressions or condensations
Lower part of a wave - correct answer ✔✔ Rarefactions
The stiffness, elasticity, and density of the material determine the - correct answer ✔✔
Propagation speed
The major component of an Ultrasound transducer is the __________________ - correct
answer ✔✔ Piezoelectric element (PZT crystal)
The property exhibited by the crystals in the US transducer that transform electrical energy into
sound and sound back to electrical energy - correct answer ✔✔ Piezoelectric Effect
Special material that has the ability to convert electrical impulses into sound waves - correct
answer ✔✔ Crystal
Comprehensive Study Guide & Review
Sound waves sent out of a - correct answer ✔✔ Transducer
Infrasound is sound with a frequency of - correct answer ✔✔ < 20 Hertz
Audible sound is sound with a frequency of - correct answer ✔✔ 20-20,000 Hertz
Ultrasound is sound with a frequency of - correct answer ✔✔ > 20,000 Hertz
Ultrasound frequencies used for DMS classes - correct answer ✔✔ 1-15 MHz range
One cycle per second - correct answer ✔✔ Hertz (Hz)
Oscillation or vibration - correct answer ✔✔ Cycle
Kilohertz = __________ Hz - correct answer ✔✔ 1000
Megahertz = ___________ Hz - correct answer ✔✔ 1,000,000
Distance traveled by one cycle - correct answer ✔✔ Wavelength
Higher frequencies have __________ wavelengths and are attenuated _____________ - correct
answer ✔✔ smaller, easier
, Lower frequencies have ___________ wavelengths and are are attenuated ____________ -
correct answer ✔✔ longer, less easy
The reduction is the amplitude and intensity of a sound wave as it propagates through a
medium - correct answer ✔✔ Attenuation
What causes attenuation - correct answer ✔✔ Absorption, scattering, and reflection
Sound waves travel through matter by causing _____________ - correct answer ✔✔ vibrations
along the path
Another name for traveling through matter - correct answer ✔✔ propagate
High part of a wave - correct answer ✔✔ compressions or condensations
Lower part of a wave - correct answer ✔✔ Rarefactions
The stiffness, elasticity, and density of the material determine the - correct answer ✔✔
Propagation speed
The major component of an Ultrasound transducer is the __________________ - correct
answer ✔✔ Piezoelectric element (PZT crystal)
The property exhibited by the crystals in the US transducer that transform electrical energy into
sound and sound back to electrical energy - correct answer ✔✔ Piezoelectric Effect
Special material that has the ability to convert electrical impulses into sound waves - correct
answer ✔✔ Crystal
