# Ultrasound Physics Midterm Ch 1-7

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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.

• 1.

### Impedance means?

• A.

Acoustic resistance

• B.

Power/ volume

• C.

Backscatter

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

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

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

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

B. Bull's eye
Explanation
p 81

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• 6.

### What means the weaking of sound

• A.

Impedance

• B.

Refraction

• C.

Attenuation

C. Attenuation
Explanation
p 78

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• Current Version
• Mar 21, 2023
Quiz Edited by
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• Jun 08, 2011
Quiz Created by
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