Please select all that apply By definition, ultrasound waves: a. carry energy b.
ID: 2268200 • Letter: P
Question
Please select all that apply
By definition, ultrasound waves: a. carry energy b. have a frequency below 20 MHz c. can propagate in water d. can propagate in air e. can propagate in the vacuum
The following properties are characteristic of the material in which the sound wave propagates: a. speed of sound b. acoustic impedance c. wavelength d. acoustic attenuation
The properties of the material through which an ultrasound signal propagates affect: a. frequency b. wavelength c. speed of sound
Increasing the nominal frequency of the ultrasound signals will lead to a. smaller wavelengths b. higher speed of sound c. better spatial resolution d. reduced penetration depth e. increased acoustic power
Increasing imaging depth a. increases attenuation b. improves image contrast c. improves the spatial resolution d. improves visualization of shallow structures
The speed of sound in a pulse-echo imaging systems for biomedical applications is assumed to be a. the same as in water, 1490 m/s b. 1540 m/s c. can be specified by the operator d. does not need to be specified
Explanation / Answer
1) a) Yes they carry energy as sound is a mechanical wave and it consists of physical oscillatory motion hence it carries energy hence true
b)Ultra sound Range from 20 KHz - 2GHz hence false
c) yes it can propogate in water and it has a very important role that is SONAR that is underwater range finder.
d) Yes they can propogate in air, they are used to find distance 2 objects with same principal as SONAR.
e) No they cannot travel in vacuum as sound need medium to travel
a), c), d).
2) Speed of the sound, wavelength, acoustic attenuation are characteristics of the material in which sound propagate
a), c), d)
3) only wavelength and sound are afftected by change in material
b), c)
4)a) wavelength inversly propotional to frequency hence true,
b) speed does not change
c) Sparial resolution does not depend on frequency
d) as frequency is increased penetration of ultrasound in a test material decreases and vice versa
e) no
a), d)
5) b), c), d)
6) b)
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