DMS206 (Physics) Test With Complete
Solution
400 ms = ______s - Answer .4
Ten to the third power is equivalent to: - Answer 1000
How long will it take a sound wave to travel to the depth of 10cm in soft tissue? - Answer
.000065 s
In the formula a=b/c, If c increases what will happen to the value of a? - Answer a will
decrease
In the formula a=b/c, If b increases what will happen to the value of a? - Answer a will
increase
1000 m/s = _________cm/ms - Answer 100
The reciprocal of 5 is: - Answer .2
In the formula a=b/c, If b increases and a remains the same, what must have happened
to c? - Answer Increased
.001 cm =__________mm - Answer .01
3 m =_________mm - Answer 3000
What is the number of cycles an acoustic variable completes in a second? - Answer
Frequency
With standard imaging, what happens to the period of the wave as it propagates? -
Answer Remains the same
Sound can be characterized as: - Answer Cyclical oscillations in certain variables
As an ultrasound wave propagates through a body the amplitude usually - Answer
Decreases
The part of the wave where acoustic pressure is the highest is called the ______. -
Answer Compression zone
The following are acoustic variables except: - Answer Wavelength
The length of one complete cycle is called _____. - Answer Wavelength
If the intensity of the ultrasound beam passing through bone is decreased by a factor of
2, this corresponds to a decibel change of ______. - Answer -3dB
What is the wavelength of ultrasound in a medium if the velocity is 15.4 mm/s and the
, frequency is 3.25 MHz? - Answer 4.7X10-6 mm
What is the frequency of ultrasound in a medium if the wavelength is 3.26 x 10-5 km and
the velocity is 16,450 mm/s? - Answer 0.503Khz
The bending of an ultrasound beam by refraction depends on the _____ between the two
mediums forming the interface. - Answer Velocities
If sound travels at exactly 1540 m/s in a particular medium, the medium: - Answer May
be soft tissue
When the elasticity of a medium is high, the ______ is high. - Answer Compressibility
What are the two properties that establish sounds propagation speed in a given
medium? - Answer Density and stiffness
As the thickness of the two materials forming an interface is increased, the intensity of
the reflected echoes ______. - Answer Remains unchanged
As the bulk modulus of a medium increases the propagation speed ______. - Answer
Increases
Snell's Law is a declaration concerning the behavior of waves during a particular
physical process or event. What is this event? - Answer Refraction
The speed with which a sound pulse travels through tissue depends on the: - Answer
Tissue density and stiffness
If an ultrasound beam is directed at an interface at an 18 degree angle of incidence and
the velocity in medium 1 is more than the velocity in medium 2, the beam will ______. -
Answer Bend towards the norm
Refraction does not occur under the conditions of? - Answer Normal incidence &
velocity 1 = velocity 2
If wavelength decreases what happen to the DF? - Answer Decreases
If depth increases what happen to the frame rate? - Answer Decreases
If SPL decreases what happen to the DF? - Answer Decreases
If the cycles in a pulse doubles what happens to the PD? - Answer Doubles
If PD increases what happens to the DF? - Answer Increases
If PRP decreases what happens to the DF? - Answer Increases
If frequency increases what happens to the PD? - Answer Decreases
Using a given transducer and machine, what happens to the SPL as the sonographer
increases the maximum imaging depth? - Answer Remains unchanged
Solution
400 ms = ______s - Answer .4
Ten to the third power is equivalent to: - Answer 1000
How long will it take a sound wave to travel to the depth of 10cm in soft tissue? - Answer
.000065 s
In the formula a=b/c, If c increases what will happen to the value of a? - Answer a will
decrease
In the formula a=b/c, If b increases what will happen to the value of a? - Answer a will
increase
1000 m/s = _________cm/ms - Answer 100
The reciprocal of 5 is: - Answer .2
In the formula a=b/c, If b increases and a remains the same, what must have happened
to c? - Answer Increased
.001 cm =__________mm - Answer .01
3 m =_________mm - Answer 3000
What is the number of cycles an acoustic variable completes in a second? - Answer
Frequency
With standard imaging, what happens to the period of the wave as it propagates? -
Answer Remains the same
Sound can be characterized as: - Answer Cyclical oscillations in certain variables
As an ultrasound wave propagates through a body the amplitude usually - Answer
Decreases
The part of the wave where acoustic pressure is the highest is called the ______. -
Answer Compression zone
The following are acoustic variables except: - Answer Wavelength
The length of one complete cycle is called _____. - Answer Wavelength
If the intensity of the ultrasound beam passing through bone is decreased by a factor of
2, this corresponds to a decibel change of ______. - Answer -3dB
What is the wavelength of ultrasound in a medium if the velocity is 15.4 mm/s and the
, frequency is 3.25 MHz? - Answer 4.7X10-6 mm
What is the frequency of ultrasound in a medium if the wavelength is 3.26 x 10-5 km and
the velocity is 16,450 mm/s? - Answer 0.503Khz
The bending of an ultrasound beam by refraction depends on the _____ between the two
mediums forming the interface. - Answer Velocities
If sound travels at exactly 1540 m/s in a particular medium, the medium: - Answer May
be soft tissue
When the elasticity of a medium is high, the ______ is high. - Answer Compressibility
What are the two properties that establish sounds propagation speed in a given
medium? - Answer Density and stiffness
As the thickness of the two materials forming an interface is increased, the intensity of
the reflected echoes ______. - Answer Remains unchanged
As the bulk modulus of a medium increases the propagation speed ______. - Answer
Increases
Snell's Law is a declaration concerning the behavior of waves during a particular
physical process or event. What is this event? - Answer Refraction
The speed with which a sound pulse travels through tissue depends on the: - Answer
Tissue density and stiffness
If an ultrasound beam is directed at an interface at an 18 degree angle of incidence and
the velocity in medium 1 is more than the velocity in medium 2, the beam will ______. -
Answer Bend towards the norm
Refraction does not occur under the conditions of? - Answer Normal incidence &
velocity 1 = velocity 2
If wavelength decreases what happen to the DF? - Answer Decreases
If depth increases what happen to the frame rate? - Answer Decreases
If SPL decreases what happen to the DF? - Answer Decreases
If the cycles in a pulse doubles what happens to the PD? - Answer Doubles
If PD increases what happens to the DF? - Answer Increases
If PRP decreases what happens to the DF? - Answer Increases
If frequency increases what happens to the PD? - Answer Decreases
Using a given transducer and machine, what happens to the SPL as the sonographer
increases the maximum imaging depth? - Answer Remains unchanged
