EDELMAN: COMPREHENSIVE EXAM | THE SMART WAY TO
PASS | REAL TESTS, REAL RESULTS!
Sound waves are? - answer: longitudinal, mechanical
The speed of us in soft tissue is closest to: - answer: 1,500 m/s (1,540 m/s)
The frequency closest to the lower limit of us is: - answer: 15,000 hz
Which is not an acoustic variable? - answer: intensity
The effects of soft tissue on us are called: - answer: acoustic propagation properties
All of the following are true except: - answer: two waves with identical frequencies must
interfere constructively
Put in decreasing order: - answer: deca, deci, centi, micro
______________ is the time to complete one cycle - answer: period
Which of the following sound waves is ultrasonic and least useful in diagnostic imaging? -
answer: 30 khz
What is the frequency of a wave with 1msec period? - answer: 1 khz
_____________ is the distance covered by one cycle - answer: wavelength
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1
,Which of the following is determined by the source and the medium? - answer: range
resolution
Propagation speed = ________ x wavelength - answer: frequency
As a result of ____________ the propagation speed increases - answer: decreasing
compressibility and decreasing density
Put in decreasing order of propagation speed - answer: solid, liquid, gas
If the frequency of us is increased from 0.77 mhz to 1.54 mhz, what happens to the
wavelength? - answer: halved
A sound wave's frequency is 10mhz. The wave is traveling in soft tissue. What is its
wavelength? - answer: 0.15 mm
If the frequency of an us wave is doubled, what happens to the period? - answer: halved
If the frequency of us is increased from 0.77 mhz to 1.54 mhz, what happens to the
propagation speed? - answer: remains the same
The units of pulse repetition frequency are? - answer: per minute
The time from the beginning of a pulse until its end is __________? - answer: pulse duration
What happens to the speed of sound in a medium when the bulk modulus of the medium
increases? - answer: faster
APPHIA – Crafted with Care and Precision for Academic Excellence.
2
, ____________ resolution is determined by the spatial pulse length - answer: axial/radial
If a wave's amplitude is doubled, what happens to the power? - answer: quadrupled
If the level of an acoustic variable ranges from 55 to 105, what is the amplitude? - answer:
25
Power of sound has units of? - answer: watts
If the intensity of a sound beam remains unchanged while the beam area is reduced in half,
what has happened to the power? - answer: halved
Which of these intensities is smallest? - answer: sata
The duty factor for continuous wave ultrasound is? - answer: 1
What is the minimum value of the duty factor? - answer: 0.0%
What are the units of intensity? - answer: watts/cm2
What happens to the speed of sound in a medium when the bulk modulus of the medium
decreases? - answer: slower
The units of attenuation are _________; this is a ____________ scale. - answer: db,
logarithmic
APPHIA – Crafted with Care and Precision for Academic Excellence.
3
PASS | REAL TESTS, REAL RESULTS!
Sound waves are? - answer: longitudinal, mechanical
The speed of us in soft tissue is closest to: - answer: 1,500 m/s (1,540 m/s)
The frequency closest to the lower limit of us is: - answer: 15,000 hz
Which is not an acoustic variable? - answer: intensity
The effects of soft tissue on us are called: - answer: acoustic propagation properties
All of the following are true except: - answer: two waves with identical frequencies must
interfere constructively
Put in decreasing order: - answer: deca, deci, centi, micro
______________ is the time to complete one cycle - answer: period
Which of the following sound waves is ultrasonic and least useful in diagnostic imaging? -
answer: 30 khz
What is the frequency of a wave with 1msec period? - answer: 1 khz
_____________ is the distance covered by one cycle - answer: wavelength
APPHIA – Crafted with Care and Precision for Academic Excellence.
1
,Which of the following is determined by the source and the medium? - answer: range
resolution
Propagation speed = ________ x wavelength - answer: frequency
As a result of ____________ the propagation speed increases - answer: decreasing
compressibility and decreasing density
Put in decreasing order of propagation speed - answer: solid, liquid, gas
If the frequency of us is increased from 0.77 mhz to 1.54 mhz, what happens to the
wavelength? - answer: halved
A sound wave's frequency is 10mhz. The wave is traveling in soft tissue. What is its
wavelength? - answer: 0.15 mm
If the frequency of an us wave is doubled, what happens to the period? - answer: halved
If the frequency of us is increased from 0.77 mhz to 1.54 mhz, what happens to the
propagation speed? - answer: remains the same
The units of pulse repetition frequency are? - answer: per minute
The time from the beginning of a pulse until its end is __________? - answer: pulse duration
What happens to the speed of sound in a medium when the bulk modulus of the medium
increases? - answer: faster
APPHIA – Crafted with Care and Precision for Academic Excellence.
2
, ____________ resolution is determined by the spatial pulse length - answer: axial/radial
If a wave's amplitude is doubled, what happens to the power? - answer: quadrupled
If the level of an acoustic variable ranges from 55 to 105, what is the amplitude? - answer:
25
Power of sound has units of? - answer: watts
If the intensity of a sound beam remains unchanged while the beam area is reduced in half,
what has happened to the power? - answer: halved
Which of these intensities is smallest? - answer: sata
The duty factor for continuous wave ultrasound is? - answer: 1
What is the minimum value of the duty factor? - answer: 0.0%
What are the units of intensity? - answer: watts/cm2
What happens to the speed of sound in a medium when the bulk modulus of the medium
decreases? - answer: slower
The units of attenuation are _________; this is a ____________ scale. - answer: db,
logarithmic
APPHIA – Crafted with Care and Precision for Academic Excellence.
3
