direction of wave doesn't change from medium 1 to medium 2

Ultrasound Physics Midterm Ch 1-7

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Questions: 6 | Attempts: 715 | Updated: Mar 21, 2023

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When people think of ultrasounds, they typically picture an ultrasonic image of a foetus in the womb, but the physics and application of the concept stretches quite far beyond that. What are the physics behind the practice? Let’s find out.

Questions and Answers

1.

Impedance means?
- A.
  
  Acoustic resistance
- B.
  
  Power/ volume
- C.
  
  Backscatter
Correct Answer
A. Acoustic resistance

Explanation
Impedance- acoustic resistance to sound traveling in a medium W/cm^2
p 86

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2.

Refraction means
- A.
  
  Angle of incidence is 0 degree
- B.
  
  Direction of wave doesn't change from medium 1 to medium 2
- C.
  
  Transmission with a bend
Correct Answer
C. Transmission with a bend

Explanation
p 99
-Change of direction of wave propagation when traveling from one medium to another

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3.

Diffuse Reflection:
- A.
  
  Off - axis
- B.
  
  Backscatter
- C.
  
  Bull's eyes effect
Correct Answer
B. Backscatter

Explanation
p 80 wave reflects off an irregular surface
Backscatter

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4.

Which one means: Light wave strikes a mirror
- A.
  
  Specular Reflection
- B.
  
  Reflection
- C.
  
  Diffuse Reflection
Correct Answer
A. Specular Reflection

Explanation
p. 79

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5.

What is an example of rayleigh scattering?
- A.
  
  Backscatter
- B.
  
  Bull's eye
- C.
  
  Rayls
Correct Answer
B. Bull's eye

Explanation
p 81

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0
1
6.

What means the weaking of sound
- A.
  
  Impedance
- B.
  
  Refraction
- C.
  
  Attenuation
Correct Answer
C. Attenuation

Explanation
p 78

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Ultrasound Physics Midterm Ch 1-7

Impedance means?

Refraction means

Diffuse Reflection:

Which one means: Light wave strikes a mirror

What is an example of rayleigh scattering?

What means the weaking of sound