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Ultrasound Physics > Chapter 3 > Flashcards

Chapter 3 Flashcards

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1
Q

What are the units of wavelength?

A

millimeters (mm)

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2
Q

What are the units of frequency?

A

hertz

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3
Q

What are the units of intensity?

A

Watts/cm2

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4
Q

What are the units of propagation speed?

A

meters/second

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5
Q

What are the units of period?

A

seconds or time

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6
Q

What are the units of power?

A

Watts (W)

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7
Q

Does the medium/ the sound source/ both determine this parameter?
wavelength

A

both

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8
Q

Does the medium/ the sound source/ both determine this parameter?
frequency

A

sound source

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9
Q

Does the medium/ the sound source/ both determine this parameter?
intensity (initial)

A

sound source

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10
Q

Does the medium/ the sound source/ both determine this parameter?
propagation speed

A

medium

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11
Q

Does the medium/ the sound source/ both determine this parameter?
period

A

sound source

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12
Q

Does the medium/ the sound source/ both determine this parameter?
power (initial)

A

sound source

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13
Q

Does the medium/ the sound source/ both determine this parameter?
amplitude (initial)

A

sound source

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14
Q

When using a ultrasound system and transducer can this be changed by the operator?
wavelength

A

cannot

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15
Q

When using a ultrasound system and transducer can this be changed by the operator?
frequency

A

cannot

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16
Q

When using a ultrasound system and transducer can this be changed by the operator?
intensity

A

can

17
Q

When using a ultrasound system and transducer can this be changed by the operator?
propagation speed

A

cannot

18
Q

When using a ultrasound system and transducer can this be changed by the operator?
period

A

cannot

19
Q

When using a ultrasound system and transducer can this be changed by the operator?
power

A

can

20
Q

When using a ultrasound system and transducer can this be changed by the operator?
amplitude (initial)

A

can

21
Q

True or False. A wave with a frequency of 15,000 MHz is ultrasonic

A

True. Ultrasound is defined as any wave with a frequency greater than 20,000 hertz. 15,000 MHz is a frequency of 15,000,000,000 Hz.

22
Q

True of False. If the amplitude of a wave is increased to 3 times its original value, the intensity is increased by 6 times.

A

False. Intensity is proportional to the amplitude squared. If we triple the amplitude, we increase the intensity by a factor of nine.

23
Q

Questions 6-12 needs to be studied in book

A
24
Q

True or False. If the power of a wave is halved, the intensity is reduced to one-fourth its original value.

A

False. Intensity is the power of a beam divided by its cross sectional area. If we halve the power, we will halve the intensity.

25
Q

True or False. Propagation speed increases as frequency increases.

A

False. Propagation speed is determined by the medium only. Frequency and speed are unrelated.

26
Q

Medium 1 has a density of 9 and a stiffness of 6. Medium 2 has a density of 8 and a stiffness of 6. In which medium will sound travel slower?

A

Medium 1. Since both media have the same stiffness, the medium with the greater density has the lower propagation speed.

27
Q

Which of the following characteristics will create the fastest speed of sound?
A. high density, high stiffness
B. low density, high stiffness
C. high density, low stiffness
D. low density, low stiffness

A

B. speed is inversely proportional to density and directly proportional to stiffness

Ultrasound Physics (3 decks)

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