Ultrasound Physics (Midterm Exam
Review) |Questions with 100%
Answers
What 2 words are used to describe sound? - -Longitudinal & Mechanical
- Decreased dynamic range/compression= what type of contrast? - -Higher
contrast (less shades of grey)
- Increased dynamic range/compression= what type of contrast? - -Less
contrast (more shades of grey)
- What are 7 acoustic parameters that describe a sound wave? - -1. Period
2. Frequency
3. Amplitude
4. Power
5. Intensity
6. Wavelength
7. Propagation Speed
- What are the 3 acoustic variables? - -1. Pressure
2. Density
3. Distance
- What type of wave moves in a direction that is perpendicular to the
direction that the wave propagates? - -Transverse Waves
- What type of waves moves in the same direction that the wave
propagates? - -Longitudinal Waves
- A pair of waves are considered ______________ when their peaks (maximum
value) and troughs (minimum value) occur at the same time and location. - -
IN-PHASE
- A pair of waves are considered________________ when their peaks and
troughs occur at different times. - -OUT-OF-PHASE
- This occurs when the interference of a pair of out-of-phase waves results in
the formation of a single wave of lesser amplitude than at least one of its
components. - -Destructive Interference
, - This occurs when the interference of a pair of in-phase waves result in the
formation of a wave of greater amplitude than either of its components. - -
Constructive Interference
- What is the time it takes a wave to vibrate a single cycle, or the time from
the start of one cycle to the start of the next cycle? - -Period
- What is the number of particle events that occur in a specific duration of
time? - -Frequency
- Infrasound - -Sound waves with frequencies below 20 Hz.
- audible sound - -between 20 Hz and 20 kHz
- Ultrasound - -Sound waves with frequencies above 20kHz (20,000 Hz).
- If frequency increases, the wavelength will... - -decrease
- If frequency increases, the period..... - -decreases
- What 3 parameters describe the size, magnitude, or strength of a sound
wave? - -1. Intensity
2. Power
3. Amplitude
(Also known as the "Bigness Parameters")
- What is 2x's the value of amplitude? - -peak-to-peak amplitude
- What is the measure of the degree of change in an acoustic variable from
resting position to the maximum disturbance? - -Amplitude
- What is the weakening of amplitude? - -Attenuation
- What is the rate of energy transfer? - -Power
- What is the parameter energy per unit area of sound beam? - -Intensity
- Where is the intensity the greatest? - -At the focal zone
- What is the distance or length of one complete cycle? - -Wavelength
- What is the rate at which a sound wave travels through a medium? - -
Propagation Speed
- What is the speed of sound in soft tissue? - -1,540 m/s
Review) |Questions with 100%
Answers
What 2 words are used to describe sound? - -Longitudinal & Mechanical
- Decreased dynamic range/compression= what type of contrast? - -Higher
contrast (less shades of grey)
- Increased dynamic range/compression= what type of contrast? - -Less
contrast (more shades of grey)
- What are 7 acoustic parameters that describe a sound wave? - -1. Period
2. Frequency
3. Amplitude
4. Power
5. Intensity
6. Wavelength
7. Propagation Speed
- What are the 3 acoustic variables? - -1. Pressure
2. Density
3. Distance
- What type of wave moves in a direction that is perpendicular to the
direction that the wave propagates? - -Transverse Waves
- What type of waves moves in the same direction that the wave
propagates? - -Longitudinal Waves
- A pair of waves are considered ______________ when their peaks (maximum
value) and troughs (minimum value) occur at the same time and location. - -
IN-PHASE
- A pair of waves are considered________________ when their peaks and
troughs occur at different times. - -OUT-OF-PHASE
- This occurs when the interference of a pair of out-of-phase waves results in
the formation of a single wave of lesser amplitude than at least one of its
components. - -Destructive Interference
, - This occurs when the interference of a pair of in-phase waves result in the
formation of a wave of greater amplitude than either of its components. - -
Constructive Interference
- What is the time it takes a wave to vibrate a single cycle, or the time from
the start of one cycle to the start of the next cycle? - -Period
- What is the number of particle events that occur in a specific duration of
time? - -Frequency
- Infrasound - -Sound waves with frequencies below 20 Hz.
- audible sound - -between 20 Hz and 20 kHz
- Ultrasound - -Sound waves with frequencies above 20kHz (20,000 Hz).
- If frequency increases, the wavelength will... - -decrease
- If frequency increases, the period..... - -decreases
- What 3 parameters describe the size, magnitude, or strength of a sound
wave? - -1. Intensity
2. Power
3. Amplitude
(Also known as the "Bigness Parameters")
- What is 2x's the value of amplitude? - -peak-to-peak amplitude
- What is the measure of the degree of change in an acoustic variable from
resting position to the maximum disturbance? - -Amplitude
- What is the weakening of amplitude? - -Attenuation
- What is the rate of energy transfer? - -Power
- What is the parameter energy per unit area of sound beam? - -Intensity
- Where is the intensity the greatest? - -At the focal zone
- What is the distance or length of one complete cycle? - -Wavelength
- What is the rate at which a sound wave travels through a medium? - -
Propagation Speed
- What is the speed of sound in soft tissue? - -1,540 m/s
