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Ultrasound Physics > Ch 2: Sound > Flashcards

Ch 2: Sound Flashcards

1
Q

acoustic propagation properties

A

the effects of the medium upon the sound wave

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2
Q

biologic effects

A

the effects of the sound wave upon the biologic tissue through which it passes

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3
Q

compressed

A

squeezed together

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4
Q

rarefied

A

stretched apart

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5
Q

Sound travels in a (straight/crooked) line.

A

straight

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6
Q

Sound waves are (longitudinal/transverse) waves.

A

longitudinal

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7
Q

These are used to distinguish between sound waves and other types of waves.

A

acoustic variables

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8
Q

Name the acoustic variables.

A

pressure, density, distance

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9
Q

Define pressure

A

concentration of force in an area - units: pascals (Pa)

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10
Q

Define density

A

concentration of mass in a volume - units: kg/cm^3

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11
Q

Define distance

A

measure of particle motion - units: cm, mm

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12
Q

These are required to completely describe the features of a sound wave.

A

acoustic parameters

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13
Q

Name the acoustic parameters.

A

period, frequency, amplitude, power, intensity, wavelength, propagation speed

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14
Q

transverse wave

A

wave in which the particles move in a direction that is perpendicular to the direction fo the wave.

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15
Q

longitudinal wave

A

wave in which the particles move in the same direction of the wave.

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16
Q

in-phase

A

when the peaks and troughs of a pair of waves occur at the same time and place

17
Q

out-of-phase

A

when the peaks and troughs of a pair of waves occur at a different time and place

18
Q

interference

A

when a wave combines with another wave and loses its individual characteristics

19
Q

constructive interference

A

when a pair of in-phase waves combine to form a greater amplitude than either of its components

20
Q

destructive interference

A

when a pair of out-of-phase waves combine to form a lesser amplitude of its components

21
Q

Both constructive and destructive interference occurs when…

A

two waves of differing frequencies combine.

Ultrasound Physics (23 decks)

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