Refraction only occurs if there is:

oblique incidence & different propagation speeds

normal incidences & different impedances

indirect intensity & different propagation speeds

obligue frequency & identical impedances

Physics Ardms

8 Questions | By Chnyc1978 | Updated: Jan 24, 2013 | Attempts: 503

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1.

Refraction only occurs if there is:
- A.
  
  Normal incidences & different impedances
- B.
  
  Indirect intensity & different propagation speeds
- C.
  
  Oblique incidence & different propagation speeds
- D.
  
  Obligue frequency & identical impedances
Correct Answer
C. Oblique incidence & different propagation speeds
2.

With normal incidence, what factors affect refraction of US?
- A.
  
  Propagation speeds
- B.
  
  Frequencies
- C.
  
  Attenuation coefficients
- D.
  
  None of the above
Correct Answer
D. None of the above
3.

true or false - With right angle incidence, reflections are always generated at the boundry if the propagation speeds of the media are different.
- A.
  
  TRUE
- B.
  
  FALSE
Correct Answer
B. FALSE
4.

_______ is a redirection of US in many directions as a result of a rough boundary between two media.
- A.
  
  Refraction
- B.
  
  Rayleigh scattering
- C.
  
  Scattering
- D.
  
  Reflection
Correct Answer
C. Scattering
5.

True or False - With normal incidence the angle is 180
- A.
  
  True
- B.
  
  False
Correct Answer
B. False
6.

Under which of the following conditions is axial resolution improved?
- A.
  
  Decreased spacial pulse length
- B.
  
  Decreased pulse amplitude
- C.
  
  Decreased imaging depth
- D.
  
  Decreased pixel size
Correct Answer
A. Decreased spacial pulse length
7.

Snells law describes physics of _______?
- A.
  
  Ultrasound
- B.
  
  Reflection
- C.
  
  Refraction
- D.
  
  Transmission
Correct Answer
C. Refraction
8.

The most likely amount of reflection at a boundary between soft tissue is
- A.
  
  1%
- B.
  
  22%
- C.
  
  34%
- D.
  
  99%
Correct Answer
A. 1%

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Current Version
Jan 24, 2013

Quiz Edited by
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Mar 31, 2011

Quiz Created by
Chnyc1978

Physics Ardms

Refraction only occurs if there is:

With normal incidence, what factors affect refraction of US?

true or false - With right angle incidence, reflections are always generated at the boundry if the propagation speeds of the media are different.

_______ is a redirection of US in many directions as a result of a rough boundary between two media.

True or False - With normal incidence the angle is 180

Under which of the following conditions is axial resolution improved?

Snells law describes physics of _______?

The most likely amount of reflection at a boundary between soft tissue is