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ARDMS SPI Exam ( 2026/2027 Update) Questions and Answers
ARDMS SPI Exam ( 2026/2027
Update) Questions and Answers
Q: What does rarefied mean?
Answer:
Stretched apart
Q: Sound travels in a ________ line.
Answer:
Straight
Q: Sound waves are ____________ waves.
Answer:
Longitudinal
Q: What is the propagation speed dependent on?
Answer:
The medium
Q: Are there any biologic effects on tissue?
Answer:
No
Q: Sound waves are identified by
Answer:
Oscillations in acoustic variables
Q: What are the three acoustic variables? (With their units)
Answer:
pressure - pascals (Pa), density - kg/cm^3, distance - cm, mm
Q: If something other than pressure, density, or distance (particle motion) rhythmically
oscillates in a wave, then the wave...
Answer:
Is not a sound wave
Q: Sound waves are also known as
Answer:
Acoustic waves
Q: What are the seven Acoustic Parameters?
Answer:
Period, frequency, amplitude, power, intensity, wavelength, propagation speed
Q: Particles move in a direction that is perpendicular to the direction that the wave propagates
in what wave?
Answer:
Transverse wave
Q: Particles move in the same direction that the wave propagates in a ____________ wave.
Answer:
Longitudinal
Q: When are a pair of waves considered in-phase?
Answer:
When their peaks and troughs occur at the same time and at the same location
Considered "in step"
Q: What happens when two waves are out-of-phase?
Answer:
Their peaks occur at different times, and so do their troughs
"out of step"
Q: What is interference?
Answer:
When more than one beam travels in a medium and arrive at the same location at exactly the
same time
These waves lose their individual characteristics and combine to form a single wave
Q: The interference of in-phase waves results in a single wave of _________ amplitude. This is
called ___________.
Answer:
Greater, constructive interference
(Larger Wave)
Q: The interference of a pair of out-of-phase waves results in the formation of a single wave of
_____ amplitude. This combination is called _____________________.
Answer:
Lesser, destructive interference
(Smaller Wave)
Q: When frequencies of waves differ, what kind of wave occurs?
Answer:
Both constructive and destructive interference
Q: What do waves transfer from one location to another?
Answer:
Energy
Q: Two waves are traveling in a medium and arrive at a location at the same time. What event
takes place?
Answer:
Interference
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