DAVIES PHYSICS MOCK EXAM REVIEW
QUESTIONS WITH 100% CORRECT
ANSWERS LATEST VERSION 2025/2026.
Intensity is equal to: - ANS Power / beam area²
As frequency increases, wavelength ______________ - ANS Decreases
In diagnostic ultrasound, wavelength ranges from - ANS .1 mm -.8mm
The prefix "micro" is used for - ANS Millionth
If the frequency of US is increasedfrom 0.77 MHz to 1.54 MHz, what happens to the
propagation speed? - ANS Remains the same
What is the range of frequencies used in diagnostic ultrasound ? - ANS 2 MHz - 10 MHz
Name the acoustic variables. - ANS Density
Temperature
Pressure
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,1 divided by frequency is the equation for - ANS Period
The time that it takes for one cycle to occur is called the _____ - ANS Period
The prefix "micro" means_________. - ANS 10 to the power of -6
The unit of measurement that is used for period is - ANS microseconds
The time from the beginning of a pulse to its end is _______? - ANS Pulse duration
Power of sound has units of ________________ - ANS Watts
Which of the following equations is that for frequency? - ANS Propagation speed /
wavelength
(Wavelength = prop speed/freq)
What is the log of 1000? - ANS 3
If you increase the intensity by 3dB, it _______ - ANS Doubles
Sine of transmission angle divided by Sine of incident angle = ( Propagation speed medium 1
)divided by (Propagation speed medium 2). This equation is used for _____ - ANS Snell's law
What determines the speed of sound in a material? - ANS Density and stiffness
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, Which of the following has the greatest propagation speed? - ANS Bone
Name the reasons for attenuation - ANS Absorption, reflection, and scattering
Frequency divided by 2 is the formula for ______ - ANS Attenuation coefficient
RAYL are the units used for_______ - ANS Impedance
Complete the following statement: As frequency increases, - ANS Scatter increases
The equation: "density x propagation speed" determines ______ - ANS Impedance
f the sound beam strikes the medium at a right angle and the RAYLE of medium 1 = 1.55 and the
RAYLE of medium 2 = 1.65, what is the percentage of reflected echo intensity? - ANS 0.097%
For soft tissue, the approximate attenuation coefficient in dB/cm is equal to one-half
________in ________. - ANS Frequency, MHz
Ultrasound imaging transducer typically generate pulses of how many cycles? - ANS 2-3
In a linear phased array, the beam is steered__________. - ANS Electronically
T/F: To find out the operating frequency of a transducer, the material's propagation speed is
divided by twice the thickness. - ANS True
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
QUESTIONS WITH 100% CORRECT
ANSWERS LATEST VERSION 2025/2026.
Intensity is equal to: - ANS Power / beam area²
As frequency increases, wavelength ______________ - ANS Decreases
In diagnostic ultrasound, wavelength ranges from - ANS .1 mm -.8mm
The prefix "micro" is used for - ANS Millionth
If the frequency of US is increasedfrom 0.77 MHz to 1.54 MHz, what happens to the
propagation speed? - ANS Remains the same
What is the range of frequencies used in diagnostic ultrasound ? - ANS 2 MHz - 10 MHz
Name the acoustic variables. - ANS Density
Temperature
Pressure
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,1 divided by frequency is the equation for - ANS Period
The time that it takes for one cycle to occur is called the _____ - ANS Period
The prefix "micro" means_________. - ANS 10 to the power of -6
The unit of measurement that is used for period is - ANS microseconds
The time from the beginning of a pulse to its end is _______? - ANS Pulse duration
Power of sound has units of ________________ - ANS Watts
Which of the following equations is that for frequency? - ANS Propagation speed /
wavelength
(Wavelength = prop speed/freq)
What is the log of 1000? - ANS 3
If you increase the intensity by 3dB, it _______ - ANS Doubles
Sine of transmission angle divided by Sine of incident angle = ( Propagation speed medium 1
)divided by (Propagation speed medium 2). This equation is used for _____ - ANS Snell's law
What determines the speed of sound in a material? - ANS Density and stiffness
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, Which of the following has the greatest propagation speed? - ANS Bone
Name the reasons for attenuation - ANS Absorption, reflection, and scattering
Frequency divided by 2 is the formula for ______ - ANS Attenuation coefficient
RAYL are the units used for_______ - ANS Impedance
Complete the following statement: As frequency increases, - ANS Scatter increases
The equation: "density x propagation speed" determines ______ - ANS Impedance
f the sound beam strikes the medium at a right angle and the RAYLE of medium 1 = 1.55 and the
RAYLE of medium 2 = 1.65, what is the percentage of reflected echo intensity? - ANS 0.097%
For soft tissue, the approximate attenuation coefficient in dB/cm is equal to one-half
________in ________. - ANS Frequency, MHz
Ultrasound imaging transducer typically generate pulses of how many cycles? - ANS 2-3
In a linear phased array, the beam is steered__________. - ANS Electronically
T/F: To find out the operating frequency of a transducer, the material's propagation speed is
divided by twice the thickness. - ANS True
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
