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Ultrasound Physics 1 > Chapter 2 > Flashcards

Chapter 2 Flashcards

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1
Q

What term is used to describe the effects of an ultrasound wave on living tissues?
A. Toxic effects
B. Acoustic propagation properties
C. Biological effects
D. Transmission properties

A

C. Biological effects

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2
Q

As sound waves travel through a medium, what term describes the effects of the medium on the sound wave?
A. Toxic effects
B. Acoustic propagation properties
C. Bioeffect
D. Transmission properties

A

B. Acoustic propagation properties

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3
Q

Which of the following is TRUE of all waves?
A. They travel through a medium
B. All carry energy from one site to another
C. Their amplitudes do not change
D. They travel in a straight line

A

B. All carry energy from one site to another

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4
Q

Which if the following types of waves do NOT require a medium in order to propagate? (More than one answer may be correct)
A. Light
B. Heat
C. Sound
D. Television

A

A. Light
B. Heat
D. Televisión

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5
Q

Which of the following describes the characteristics of a sound wave?
A. Longitudinal, non-mechanical
B. Mechanical, transverse
C. Transverse, acoustic
D. Mechanical, longitudinal

A

D. Mechanical, longitudinal

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6
Q

Sound is best described as ___________.
A. A series of rarefactions and compressions
B. A transverse wave
C. A wave that humans can hear
D. An oblique displacement of acoustic energy

A

A. A series of rarefactions and compressions

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7
Q

All of the following are true about sound waves EXCEPT ____________.
A. They are mechanical
B. They are transverse
C. They carry energy from place to place
D. They generally travel in a straight line

A

B. They are transverse

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8
Q

Which of the following are acoustic variable? (More than one answer may be correct)
A. Frequency
B. Pressure
C. Propagation speed
D. Wavelength
E. Voltage
F. Intensity
G. Motion of particles in the wave
H. Density

A

A. Frequency
C. Propagation speed
D. Wavelength
F. Intensity

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9
Q

Sound can be characterized as:
A. Energy flowing through a vacuum
B. A variable
C. Cyclical oscillations in certain variables
D. A principle of acoustics

A

B. A variable

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10
Q

What is the correct unit for pressure?
A. lb/in^3
B. Pa
C. Miles
D. cm

A

B. Pa

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11
Q

What is the correct unit of density?
A. Miles
B. lb/in^3
C. kg/cm^3
D. Fahrenheit degrees

A

C. kg/cm^3

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12
Q

What is the unit of particle motion?
A. Fahrenheit degrees
B. Miles
C. Pa
D. kg/m^3

A

B. Miles

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13
Q

A force is applied to a surface. If the force is tripled and the surface area over which the force is applied is also tripled, what is the new pressure?
A. Three times larger than the original
B. One third of the original
C. Six times more than the original
D. Unchanged

A

A. Three times larger than the original

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14
Q

A longitudinal wave propagate from east to west at a speed of 2 mph. What is the direction of motion of the particles within the wave?
A. From east to west
B. Alternately from east to west and then from north to south
C. From north to south only
D. Alternately from south to north and then from north to south

A

A. From east to west

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15
Q

The direction of motion of a particle in a wave is perpendicular to the direction of propagation of the wave? What type of wave is this?
A. Longitudinal
B. Acoustic
C. Mechanical
D. Transverse

A

D. Transverse

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16
Q

A particle within a transverse wave is traveling vertically. what is the direction of the waves propagation?
A. Horizontal
B. Vertical
C. Diagonal: both horizontal and vertical
D. Cannot be determined

A

B. Vertical

17
Q

Waves that exist at the same location and time will combine. What is this called?
A. Inference
B. Rarefaction
C. Interference
D. Longitudinal interaction

A

C. Interference

18
Q

Two waves arrive at the same location and interfere. The resultant sound wave is smaller than either of the two original waves. What is this called?
A. Constructive interference
B. angular interaction
C. Destructive interference
D. in-phase waves

A

C. Destructive interference

19
Q

A pair of waves are in-phase. what occurs when these waves interfere?
A. Reflection
B. Constructive interference
C. Refraction
D. Destructive interference

A

B. Constructive interference

Ultrasound Physics 1 (6 decks)

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