The horizontal axis, or x-axis - ANSWER Runs side to side
The vertical axis, or y-axis - ANSWER Runs up and down
Unrelated - ANSWER Two items that are not associated
Related or Proportional - ANSWER Two items that are associated or affiliated
However, the relationship between the items d...
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ARDMS- SPI
The horizontal axis, or x-axis - ANSWER Runs side to side
The vertical axis, or y-axis - ANSWER Runs up and down
Unrelated - ANSWER Two items that are not associated
Related or Proportional - ANSWER Two items that are associated or affiliated
However, the relationship between the items does not have to be specified
Directly related or Directly proportional - ANSWER Two items that are associated such
that when one item increases, the other increases
Inversely related or inversely proportional - ANSWER Two items are associated such
that when one item increases, the other decreases
Reciprocal Relationship - ANSWER When two numbers with a reciprocal relationship
are multiplied together, the result is one
Reciprocal numbers are inverse because when one increases, the other decreases
For a numerical answer to a question to be comprehensive, it requires a - ANSWER
Unit
"Increase by a factor" means - ANSWER To multiply by that number
"Decrease by a factor" means - ANSWER To divide by that number
Scientific or engineering notation is a shorthand manner to represent what types of
numbers? - ANSWER Very large or very small numbers
A number in scientific notation form with a positive exponent has a value - ANSWER
Greater than 10
A number in scientific notation form with an exponent of zero has a value - ANSWER
Between 1 and 10
A number in scientific notation form with a negative exponent has a value - ANSWER
Less than 1
10⌃9 - ANSWER Prefix: giga
Symbol: G
Meaning: billion
10⌃6 - ANSWER Prefix: mega
Symbol: M
Meaning: million
,ARDMS- SPI
10⌃3 - ANSWER Prefix: kilo
Symbol: k
Meaning: thousand
10⌃2 - ANSWER Prefix: hecto
Symbol: h
Meaning: hundred
10⌃1 - ANSWER Prefix: deca
Symbol: da
Meaning: ten
10⌃-1 - ANSWER Prefix: deci
Symbol: d
Meaning: tenth
10⌃-2 - ANSWER Prefix: centi
Symbol: c
Meaning: hundredth
10⌃-3 - ANSWER Prefix: milli
Symbol: m
Meaning: thousandth
Sound pulses travel through biologic tissue, or ______. - ANSWER Media
All waves carry _____ from one location to another. - ANSWER Energy
Sound is a __________ wave in which particles in the medium move. - ANSWER
Mechanical
Sound cannot travel through a ______; it must travel through a ______. - ANSWER
Vacuum, medium
What does compressed mean? - ANSWER Squeezed together
What does rarefied mean? - ANSWER Stretched apart
Sound travels in a ________ line. - ANSWER Straight
Sound waves are ____________ waves. - ANSWER Longitudinal
What is the propagation speed dependent on? - ANSWER The medium
Are there any biologic effects on tissue? - ANSWER No
Sound waves are identified by - ANSWER Oscillations in acoustic variables
What are the three acoustic variables? (With their units) - ANSWER pressure - pascals
(Pa), density - kg/cm^3, distance - cm, mm
If something other than pressure, density, or distance (particle motion) rhythmically
oscillates in a wave, then the wave... - ANSWER Is not a sound wave
Sound waves are also known as - ANSWER Acoustic waves
What are the seven Acoustic Parameters? - ANSWER Period, frequency, amplitude,
power, intensity, wavelength, propagation speed
Particles move in a direction that is perpendicular to the direction that the wave
propagates in what wave? - ANSWER Transverse wave
Particles move in the same direction that the wave propagates in a ____________
wave. - ANSWER Longitudinal
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"
, ARDMS- SPI
What happens when two waves are out-of-phase? - ANSWER Their peaks occur at
different times, and so do their troughs
"out of step"
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
The interference of in-phase waves results in a single wave of _________ amplitude.
This is called ___________. - ANSWER Greater, constructive interference
(Larger Wave)
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)
When frequencies of waves differ, what kind of wave occurs? - ANSWER Both
constructive and destructive interference
What do waves transfer from one location to another? - ANSWER Energy
Two waves are traveling in a medium and arrive at a location at the same time. What
event takes place? - ANSWER Interference
Which types of waves will exhibit both constructive and destructive interference? -
ANSWER Waves of different frequency
What units are used to report the pressure of a sound beam? - ANSWER Pascals, Pa
What describes features of a sound wave? - ANSWER Parameters
What is the source of a sound wave? - ANSWER The ultrasound system and the
transducer
Some parameters are determined by the tissue through which the sound is traveling,
also called a __________. - ANSWER Medium
What is period? And what is it determined by? - ANSWER The time it takes a wave to
vibrate a single cycle, or the time from start of a cycle to the start of the next cycle
It is determined by the source
What is frequency? And what is it determined by? - ANSWER The number of cycles
that occurs in one second
Determined by the sound source only
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