Comprehensive Exam SPI Edelman Questions And Verified
Answers || Graded A+ | 2025|2026 EXAM UPDATE
sound waves are: - longitudinal and mechanical
The speed of US in soft tissue is closest to: - 1,500 m/s
the frequency closest to the lower limit of ultrasound is: - 15,000Hz
which is not an acoustic variable? - intensity
the effects of soft tissue on US are called: - acoustic propagation properties
all the following are true EXCEPT - two waves with identical frequencies must interfere
constructively
put in decreasing order: deca, deci, micro, centi - deca, deci, centi, & micro
______ is the time to complete one cycle. - period
which of the following sound waves is ultrasonic and least useful in diagnostic imaging? -
30 KHz
what is the frequency of a wave with 1 msec period? - 1 kHz
______ is the distance covered by one cycle. - wavelength
,which of the following is determined by the source and the medium? - range resolution
propagation speed = ______ x wavelength - frequency
as a result of ______ the propagation speed increases. - decreasing compressibility and
decreasing density
put in decreasing order of propagation speed: gas, liquid, solid - solid, liquid, gas
in the same medium, if the frequency of US is increased from 0.77MHz to 1.54 MHz, what happens
to the wavelength? - halved
a sound wave's frequency is 10 MHz. the wave is traveling in soft tissue. what is its wavelength?
- 0.15 mm
if the frequency of an US wave is doubled, what happens to the period? - halved
if the frequency of US is increased from 0.77 MHz to 1.54 MHz, what happens to the propagation
speed? - remains the same
the units of pulse repetition frequency are - per minute
the time from the beginning of a pulse until its end is _____? - pulse duration
what happens to the speed of sound in a medium when the bulk modulus of the medium increases?
- faster
______ resolution is determined by the spatial pulse length. - radial & axial
, if a wave's amplitude is doubled, what happens to the power? - quadrupled
power of sound has units of - watts
if the intensity of a sound beam remains unchanged while the beam area is reduced in half, what
has happened to the power? - halved
which of these intensities is smallest? SATP, SPTP, SATA - SATA
the duty factor for continuous wave ultrasound is - 1.0
what is the minimum value of the duty factor? - 0.0%
what are the units of intensity? - watts/cm squared
what happens to the speed of sound in a medium when the bulk modulus of the medium decreases?
- slower
the units of attenuation are _____; this is a ______ scale. - dB, logarithmic
sound intensity is decreased by 75%. how many decibels of attenuation is this? - 6 dB
the fundamental frequency of a transducer is 2.5 MHz. what is the second harmonic frequency? -
5 MHz
a pulse is emitted by a transducer and is traveling in soft tissue. the go-return time, or time-of-
flight, of a sound pulse is 130 microseconds. what is the reflector depth? - 10 cm
Answers || Graded A+ | 2025|2026 EXAM UPDATE
sound waves are: - longitudinal and mechanical
The speed of US in soft tissue is closest to: - 1,500 m/s
the frequency closest to the lower limit of ultrasound is: - 15,000Hz
which is not an acoustic variable? - intensity
the effects of soft tissue on US are called: - acoustic propagation properties
all the following are true EXCEPT - two waves with identical frequencies must interfere
constructively
put in decreasing order: deca, deci, micro, centi - deca, deci, centi, & micro
______ is the time to complete one cycle. - period
which of the following sound waves is ultrasonic and least useful in diagnostic imaging? -
30 KHz
what is the frequency of a wave with 1 msec period? - 1 kHz
______ is the distance covered by one cycle. - wavelength
,which of the following is determined by the source and the medium? - range resolution
propagation speed = ______ x wavelength - frequency
as a result of ______ the propagation speed increases. - decreasing compressibility and
decreasing density
put in decreasing order of propagation speed: gas, liquid, solid - solid, liquid, gas
in the same medium, if the frequency of US is increased from 0.77MHz to 1.54 MHz, what happens
to the wavelength? - halved
a sound wave's frequency is 10 MHz. the wave is traveling in soft tissue. what is its wavelength?
- 0.15 mm
if the frequency of an US wave is doubled, what happens to the period? - halved
if the frequency of US is increased from 0.77 MHz to 1.54 MHz, what happens to the propagation
speed? - remains the same
the units of pulse repetition frequency are - per minute
the time from the beginning of a pulse until its end is _____? - pulse duration
what happens to the speed of sound in a medium when the bulk modulus of the medium increases?
- faster
______ resolution is determined by the spatial pulse length. - radial & axial
, if a wave's amplitude is doubled, what happens to the power? - quadrupled
power of sound has units of - watts
if the intensity of a sound beam remains unchanged while the beam area is reduced in half, what
has happened to the power? - halved
which of these intensities is smallest? SATP, SPTP, SATA - SATA
the duty factor for continuous wave ultrasound is - 1.0
what is the minimum value of the duty factor? - 0.0%
what are the units of intensity? - watts/cm squared
what happens to the speed of sound in a medium when the bulk modulus of the medium decreases?
- slower
the units of attenuation are _____; this is a ______ scale. - dB, logarithmic
sound intensity is decreased by 75%. how many decibels of attenuation is this? - 6 dB
the fundamental frequency of a transducer is 2.5 MHz. what is the second harmonic frequency? -
5 MHz
a pulse is emitted by a transducer and is traveling in soft tissue. the go-return time, or time-of-
flight, of a sound pulse is 130 microseconds. what is the reflector depth? - 10 cm
