SPI Exam Questions pool ( Answered)
rated A+.
Concentration of force in an area. Units are: (Pa) or Pascals. - ✔✔Pressure
What are the units for density? - ✔✔kg/cm3
What are the seven acoustic parameters and what are they determined by? - ✔✔-Period determined by
SOURCE
-Frequency determined by SOURCE
-Amplitude determined by SOURCE
-Power determined by SOURCE
-Intensity determined by SOURCE
-Wavelength determined by both SOURCE & MEDIUM
-Propagation Speed determined by MEDIUM
What is the frequency of audible sound? - ✔✔20Hz to 20 kHz
The frequency of Ultrasound is greater than? - ✔✔20kHz
What is the speed of sound in soft tissue?
List the propagation speed of different media from slowest to fastest.
*As a general rule sound travels fastest in solids, slower in liquids, and slowest in gases. -
✔✔Air>Fat>Soft Tissue (1,540 m/s)>Blood>Muscle>Bone
10^-6 is the exponent what is the prefix? What is the exponent and prefix that corresponds on the
opposite side of the metric system? - ✔✔The prefix is MICRO often meaning millionth.
,10^6, the prefix is MEGA often meaning million.
10^-9 is the exponent what is the prefix? - ✔✔The prefix is NANO often meaning billionth.
*smallest
10^-3 is the exponent what is the prefix?What is the exponent and prefix that corresponds on the
opposite side of the metric system? - ✔✔The prefix is milli often meaning thousandth.
10^3, the pefix is KILO often meaning thousand.
Peak to Peak Amplitude - ✔✔It is the difference between maximum and minimum values of an acoustic
variable. Therefore, peak-to-peak amplitude is twice the value of the amplitude.
Amplitude is the the "bigness" of the wave. It is also the difference between the maximum value and the
average or undisturbed value of an acoustic variable. What are the units? - ✔✔Pressure --Pa
Density -- g/cm^3
Particle motion --cm, in, any distance
Amplitude is the the "bigness" of the wave. It is also the difference between the maximum value and the
average or undisturbed value of an acoustic variable. What are the units? - ✔✔Watts/ cm2
What are the units for Power? - ✔✔WATTS
Is Power adjustable? - ✔✔Yes, there is a control on the ultrasound system that allows the sonographer
to alter the initial power.
How are Power and Amplitude related? - ✔✔Both amplitude and power are parameters that describe
the size, or magnitude, of a wave. When power increases so does amplitude.
power is proportional to the wave's amplitude squared.
, A sonographer has increased the amplitude of a wave by 4. How has the power changed? - ✔✔4x4=8
or
4^2=8
The power has increased 8 fold.
A sonographer has increased the amplitude of a wave by 4. How has the power changed? - ✔✔4x4=16
or
4^2=16
The power has increased 8 fold.
What is the relationship between intensity and amplitude? - ✔✔If a wave's amplitude is doubled, the
intensity is increased to four times its original value.
What are Power and Intensity both related to? - ✔✔AMPLITUDE^2
Two characteristics that affect the speed of sound - ✔✔Stiffness and Density
Stiffness and its relationship to Speed - ✔✔Stiffness and Speed are directly related.
Density and its relationship to Speed - ✔✔Density and Speed are inversely related.
*Materials that are not stiff and very dense will have the slowest speed.
Ex: Air has an exceedingly low stiffness. Therefore sound travels slowly in air.
Can wavelength and propagation speed be adjusted by the sonographer? - ✔✔No
*Speed changes only when the wave travels from one medium to a different medium.
rated A+.
Concentration of force in an area. Units are: (Pa) or Pascals. - ✔✔Pressure
What are the units for density? - ✔✔kg/cm3
What are the seven acoustic parameters and what are they determined by? - ✔✔-Period determined by
SOURCE
-Frequency determined by SOURCE
-Amplitude determined by SOURCE
-Power determined by SOURCE
-Intensity determined by SOURCE
-Wavelength determined by both SOURCE & MEDIUM
-Propagation Speed determined by MEDIUM
What is the frequency of audible sound? - ✔✔20Hz to 20 kHz
The frequency of Ultrasound is greater than? - ✔✔20kHz
What is the speed of sound in soft tissue?
List the propagation speed of different media from slowest to fastest.
*As a general rule sound travels fastest in solids, slower in liquids, and slowest in gases. -
✔✔Air>Fat>Soft Tissue (1,540 m/s)>Blood>Muscle>Bone
10^-6 is the exponent what is the prefix? What is the exponent and prefix that corresponds on the
opposite side of the metric system? - ✔✔The prefix is MICRO often meaning millionth.
,10^6, the prefix is MEGA often meaning million.
10^-9 is the exponent what is the prefix? - ✔✔The prefix is NANO often meaning billionth.
*smallest
10^-3 is the exponent what is the prefix?What is the exponent and prefix that corresponds on the
opposite side of the metric system? - ✔✔The prefix is milli often meaning thousandth.
10^3, the pefix is KILO often meaning thousand.
Peak to Peak Amplitude - ✔✔It is the difference between maximum and minimum values of an acoustic
variable. Therefore, peak-to-peak amplitude is twice the value of the amplitude.
Amplitude is the the "bigness" of the wave. It is also the difference between the maximum value and the
average or undisturbed value of an acoustic variable. What are the units? - ✔✔Pressure --Pa
Density -- g/cm^3
Particle motion --cm, in, any distance
Amplitude is the the "bigness" of the wave. It is also the difference between the maximum value and the
average or undisturbed value of an acoustic variable. What are the units? - ✔✔Watts/ cm2
What are the units for Power? - ✔✔WATTS
Is Power adjustable? - ✔✔Yes, there is a control on the ultrasound system that allows the sonographer
to alter the initial power.
How are Power and Amplitude related? - ✔✔Both amplitude and power are parameters that describe
the size, or magnitude, of a wave. When power increases so does amplitude.
power is proportional to the wave's amplitude squared.
, A sonographer has increased the amplitude of a wave by 4. How has the power changed? - ✔✔4x4=8
or
4^2=8
The power has increased 8 fold.
A sonographer has increased the amplitude of a wave by 4. How has the power changed? - ✔✔4x4=16
or
4^2=16
The power has increased 8 fold.
What is the relationship between intensity and amplitude? - ✔✔If a wave's amplitude is doubled, the
intensity is increased to four times its original value.
What are Power and Intensity both related to? - ✔✔AMPLITUDE^2
Two characteristics that affect the speed of sound - ✔✔Stiffness and Density
Stiffness and its relationship to Speed - ✔✔Stiffness and Speed are directly related.
Density and its relationship to Speed - ✔✔Density and Speed are inversely related.
*Materials that are not stiff and very dense will have the slowest speed.
Ex: Air has an exceedingly low stiffness. Therefore sound travels slowly in air.
Can wavelength and propagation speed be adjusted by the sonographer? - ✔✔No
*Speed changes only when the wave travels from one medium to a different medium.
