Physics ch. 1-4 Flashcards
How are power and frequency related
Unrelated
What are 2 components of pulse repetition period?
- Transmit time (on time)
- Receive time (off time)
How are frequency and intensity related
Unrelated
How are frequency and sound speed related
Unrelated
How are stiffness and sound speed related
Directly
How are acoustic velocity and compressibility related
Inversely
How are elasticity and speed sound related
Inversely
How are amplitude and power related
Directly
How are frequency and period related
Inversely
How are acoustic velocity and density related
Inversely
How are wavelength and intensity related
Unrelated
How are wavelength and frequency related
Inversely
How are power and intensity related
Directly
How are amplitude and intensity related
Directly
Which of the following are considered acoustic parameters?
A) Frequency
B) Density
C) Distance
D) Pressure
E) Period
A) Frequency and B) Period
If intensity remains the same while the power is double what has happened to the beam area?
Doubled
Which of the following are considered acoustic variables?
A Frequency
B Density
C Particle motion
D Temperature
E Period
F Pressure
Density
Particle Motion
Pressure
True or False: propagation speed increases as frequency increases?
False
The effects of sound waves on tissue in the body is called what?
Bioeffects
What are two components of pulse ultrasound?
*Transmit ( talking or on time)
* Receive ( listening or off time)
If the power in a beam is 1 watt and the area is 5 cm^2, what is the beam’s intensity?
0.2w/cm^2
True or false: if the Amplitude of a wave is increased to three times is the original value. The intensity is increased by 6 times.
False, intensity is increased by 9 times.
True or false: a wave with a frequency of 15,000 MHZ is ultrasonic
True
The effects of a medium on an ultrasound wave are called?
Acoustic propagation properties
What is the unit of intensity?
Watts/cm^2
What is the unit to frequency
Hz
What is the unit of wavelength
mm
What is the unit of period
Seconds
What is the unit Propagation speed
meters/sec
What is the unit to power
Watts
What is the median and what is the source?
*Propagation speed (medium)
*Frequency (sound source)
* Intensity (sound source)
*Period ( sound source)
* Wavelength (both)
Can and cannot be changed by Sonographer?
Power ( can)
Amplitude ( can)
Intensity (can)
Wavelength (can not)
Propagation speed ( can not)
Period (can not)
When frequency doubles what happens to wavelength?
Wavelength decreases by 1/2
