Sound waves
How many parameters are there in ultrasound?
a. 5
b. 7
c. 10
d. 8
b. 7
How are period and frequency related?
a. directly related
b. reciprocals
c. not related
b. reciprocals
What is the rate of energy transfer or the rate at which work is performed?
a. power
b. intensity
c. amplitude
d. none of the above
a. power
What is the only parameter that is determined by both the source and the medium?
a. frequency
b. intensity
c. wavelength
c. propagation speed
c. wavelength
What are the three "bigness parameters"?
a. amplitude, power, intensity
b. amplitude, force, power
c. amplitude, pressure, power
d. Power, intensity, pressure
a. amplitude, power, intensity
What is the difference between maximum and minimum values of an acoustic variable?
a. Frequency
b. peak to peak amplitude
c. amplitude
d. all of the above
b. peak to peak amplitude
What is the frequency of audible sound?
a. 20 Hz to 20 kHz
b. less than 20 Hz
c. more than 20 kHz
d. 20 kHz to 30 kHz
a. 20 Hz to 20 kHz
What wave is ultrasonic?
a. 300 MHz
b. 5 Hz
c. 4 MHz
d. 30 Hz
c. 4 MHz
What two things descibe the size or maggnitude of a wave?
a. pressure and power
b. amplitude and intensity
c. amplitude and power
d. power and intensity
c. amplitude and power
How fast does sound travel through soft tissue?
a. 1.54 mm/µs
b. 1,560 m/s
c. 1.54 m/s
d. None of the above
a. 1.54 mm/µs
What wave is inrasonic?
a. 4 MHz
b. 300 kHz
c. 28 Hz
d. 1 Hz
c. 28 Hz
Power is related to what?
a. amplitude squared
b. amplitude
c. intensity
d. a and c
e. b and c
d. a and c
Which of the following statements is true?
a. When stiffness increases, speed decreases. When density increases, speed decreases.
b. When stiffness increases, speed increases. When density increases, speed decreases.
c. When stiffness decreases, speed increases. When density decreases, speed decreases.
d. Stiffness and density have nothing to do with speed.
b. When stiffness increases, speed increases. When density increases, speed decreases.
What is the wavelength of 2 MHz sound in soft tissue?
a. 0.52 mm
b. 0.77 mm
c. 1.54 mm
d. 0.05 mm
b. 0.77 mm
a. higher density
b. lower speed
c.higher speed
d. lower density
b. lower speed