Edelmen's SPI Exam with verified !| !| !| !| !|
solutions
Sound waves are:
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a) electric
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b) mechanical, transverse
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c) spectral
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d) longitudinal, mechanical - ✔✔D
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The speed of sound of ultrasound in soft tissue is closest to:
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a) 1,540 km/sec
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b) 1.54 km/sec
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c) 1,500 m/s
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d) 1,540 mm/sec - ✔✔C
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Which is not an acoustic variable?
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a) density
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b) pressure
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c) distance
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d) intensity - ✔✔D
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The effects of soft tissue on ultrasound are called:
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a) acoustic proliferation properties
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,b) dynamic effects
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c) acoustic propagation properties
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d) biological effects - ✔✔C
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All of the following are true EXCEPT:
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a) two waves with identical frequencies must interfere
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constructively.
b) constructive interference is associated with waves that are in-
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phase. !|
c) out-of-phase waves interfere destructively.
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d) waves of different frequencies may exhibit both constructive
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and destructive interference at different times. - ✔✔A
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Put in decreasing order:
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a) deca
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b) deci
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c) micro
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d) centi - ✔✔abdc
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______ is the time to complete one cycle
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a) pulse duration
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b) pulse period
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c) period
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d) duration period - ✔✔C
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,Which of the following sound waves is ultrasonic and least useful
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in diagnostic imaging?
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a) 30 KHz
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b) 8 Mhz
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c) 8,000 Hz
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d) 3,000 Hz
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e) 15 Hz - ✔✔A
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______ is the distance covered by one cycle.
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a) pulse length
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b) wavelength
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c) cycle distance
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d) cycle duration - ✔✔B
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Which of the following is determined by the source and the
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medium? !|
a) frequency
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b) period
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c) propagation speed
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d) range resolution - ✔✔D
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Propagation speed = _______ x wavelength !| !| !| !| !| !|
a) pulse duration
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b) period
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c) # of cycles in the pulse
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, d) frequency - ✔✔D
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As a result of _____ the propagation speed increases.
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a) increasing stiffness and increasing density
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b) increasing stiffness and increasing elasticity
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c) decreasing compressibility and decreasing density
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d) decreasing stiffness and decreasing density. - ✔✔C
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Put in decreasing order of propagation speed.
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a) gas !| !|
b) liquid !| !|
c) solid - ✔✔c b a
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If the frequency of an ultrasound wave is doubled, what happens
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to the period?
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a) doubles!| !|
b) halved !| !|
c) remains the same
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d) 4x greater - ✔✔B
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The units of pulse repetition frequency are:
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a) per minute
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b) microseconds
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c) mm/microseconds
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solutions
Sound waves are:
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a) electric
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b) mechanical, transverse
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c) spectral
!| !|
d) longitudinal, mechanical - ✔✔D
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The speed of sound of ultrasound in soft tissue is closest to:
!| !| !| !| !| !| !| !| !| !| !| !|
a) 1,540 km/sec
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b) 1.54 km/sec
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c) 1,500 m/s
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d) 1,540 mm/sec - ✔✔C
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Which is not an acoustic variable?
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a) density
!| !|
b) pressure
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c) distance
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d) intensity - ✔✔D
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The effects of soft tissue on ultrasound are called:
!| !| !| !| !| !| !| !| !|
a) acoustic proliferation properties
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,b) dynamic effects
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c) acoustic propagation properties
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d) biological effects - ✔✔C
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All of the following are true EXCEPT:
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a) two waves with identical frequencies must interfere
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constructively.
b) constructive interference is associated with waves that are in-
!| !| !| !| !| !| !| !| !|
phase. !|
c) out-of-phase waves interfere destructively.
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d) waves of different frequencies may exhibit both constructive
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and destructive interference at different times. - ✔✔A
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Put in decreasing order:
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a) deca
!| !|
b) deci
!| !|
c) micro
!| !|
d) centi - ✔✔abdc
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______ is the time to complete one cycle
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a) pulse duration
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b) pulse period
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c) period
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d) duration period - ✔✔C
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,Which of the following sound waves is ultrasonic and least useful
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in diagnostic imaging?
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a) 30 KHz
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b) 8 Mhz
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c) 8,000 Hz
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d) 3,000 Hz
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e) 15 Hz - ✔✔A
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______ is the distance covered by one cycle.
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a) pulse length
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b) wavelength
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c) cycle distance
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d) cycle duration - ✔✔B
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Which of the following is determined by the source and the
!| !| !| !| !| !| !| !| !| !| !|
medium? !|
a) frequency
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b) period
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c) propagation speed
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d) range resolution - ✔✔D
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Propagation speed = _______ x wavelength !| !| !| !| !| !|
a) pulse duration
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b) period
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c) # of cycles in the pulse
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, d) frequency - ✔✔D
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As a result of _____ the propagation speed increases.
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a) increasing stiffness and increasing density
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b) increasing stiffness and increasing elasticity
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c) decreasing compressibility and decreasing density
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d) decreasing stiffness and decreasing density. - ✔✔C
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Put in decreasing order of propagation speed.
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a) gas !| !|
b) liquid !| !|
c) solid - ✔✔c b a
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If the frequency of an ultrasound wave is doubled, what happens
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to the period?
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a) doubles!| !|
b) halved !| !|
c) remains the same
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d) 4x greater - ✔✔B
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The units of pulse repetition frequency are:
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a) per minute
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b) microseconds
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c) mm/microseconds
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