SPI Review Edelman Questions And Verified Answers || Graded A+ |
2025|2026 EXAM UPDATE
Which of the following choices best describes an ideal epidemiologic bioeffects study? -
Randomized and prospective
Sound waves are? - Longitudinal, mechanical
The speed of US in soft tissue is closest to? - 1,500m/s
The frequency closest to the lower limit of US is? - 15,000Hz
Which is not an acoustic variable? - Intensity
The effects of soft tissue on US are called? - Acoustic propagation properties
All of the following are true EXCEPT? - Two waves with identical frequencies must
interfere constructively
Put in decreasing order - 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? -
30KHz
What is the frequency of a wave with 1msec period? - 1kHz
,________ 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 - Solid/Liquid/Gas
If the frequency of US is increased from 0.77MHz to 1.54MHz, what happens to the wavelength?
- Halved
A sound wave's frequency is 10MHz. The wave is traveling in soft tissue. What is its wavelength?
- 0.15mm
If the frequency of an US wave is doubled, what happens to the period? - Halved
If the frequency of US is increased from 0.77MHz to 1.54MHz, 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 or 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? - SPTP
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 modules of the medium decreases?
- Slower
The units of attenuation are ______; this is a _________ scale. - dB, logarithmic
Sound intensity is decreased by 75%. How many decibles of attenuation is this? - 6dB
The fundamental frequency of a transducer is a 2.5MHz. What is the second harmonic frequency?
- 5MHz
2025|2026 EXAM UPDATE
Which of the following choices best describes an ideal epidemiologic bioeffects study? -
Randomized and prospective
Sound waves are? - Longitudinal, mechanical
The speed of US in soft tissue is closest to? - 1,500m/s
The frequency closest to the lower limit of US is? - 15,000Hz
Which is not an acoustic variable? - Intensity
The effects of soft tissue on US are called? - Acoustic propagation properties
All of the following are true EXCEPT? - Two waves with identical frequencies must
interfere constructively
Put in decreasing order - 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? -
30KHz
What is the frequency of a wave with 1msec period? - 1kHz
,________ 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 - Solid/Liquid/Gas
If the frequency of US is increased from 0.77MHz to 1.54MHz, what happens to the wavelength?
- Halved
A sound wave's frequency is 10MHz. The wave is traveling in soft tissue. What is its wavelength?
- 0.15mm
If the frequency of an US wave is doubled, what happens to the period? - Halved
If the frequency of US is increased from 0.77MHz to 1.54MHz, 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 or 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? - SPTP
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 modules of the medium decreases?
- Slower
The units of attenuation are ______; this is a _________ scale. - dB, logarithmic
Sound intensity is decreased by 75%. How many decibles of attenuation is this? - 6dB
The fundamental frequency of a transducer is a 2.5MHz. What is the second harmonic frequency?
- 5MHz
