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Ultrasound Physics > unit 1 quiz > Flashcards

unit 1 quiz Flashcards

1
Q

Sound is…

A

A mechanical and longitudinal wave

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2
Q

Power is…

A

Measured in milliwatts, proportional to amplitude squared, and intensity is proportional to power

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3
Q

The wavelength for a 5 MHz sound wave in tissue is about

A

0.3 mm
Wavelength = 1.54 /F(MHz)
Wavelength = 1.54 / 5
Wavelength = 0.3 mm

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4
Q

Acoustic parameters

A

Period, propagation speed and frequency

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5
Q

Sound can propagate through…

A

Titanium, water and piezoelectric materials

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6
Q

Sound cannot propagate through…

A

A vacuum

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7
Q

Speed of sound materials listed from lowest to highest

A

Air, water, tissue and bone

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8
Q

Only determined by sound source

A

Frequency, period, amplitude, power and intensity

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9
Q

Determined by a medium

A

Speed

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10
Q

Determined by sound and a medium

A

Wavelength

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11
Q

Average speed of sound

A

1540 m/s

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12
Q

The inertia of the medium describes its…

A

Density

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13
Q

Wavelength is related to…

A

Inversely related to frequency and directly related to period

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14
Q

The distance over which one cycle occurs

A

Wavelength

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15
Q

Density and propagation speed are

A

Inversely related

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16
Q

Measurement for propagation speed

A

Millimeters per microsecond

17
Q

Peak to peak is…

A

Wavelength

18
Q

If the transmit voltage is increased from 2 to 4 Volts, the frequency will…

A

Not change

19
Q

0 - 20 Hz

A

Infrasound

20
Q

2 MHz - 20 MHz

A

Diagnostic Ultrasound

21
Q

20 Hz - 20 kHz

A

Audible sound

22
Q

> 20 kHz

A

Ultrasound

23
Q

What happens to the intensity if the amplitude is increased by a factor of 3?`

A

Increases by a factor of 9, bc amplitude squared

24
Q

What happens to intensity if the power is increased by a factor of 3

A

Increases by a factor of 3, bc intensity and power are =

25
Q

What are the 3 direct sound parameters

A

Amplitude, power and intensity

26
Q

What are the 3 acoustic VARIABLES

A

Pressure, density and distance

27
Q

What are the 3 BIGNESS parameters

A

Amplitude, power and intensity

Ultrasound Physics (2 decks)

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