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Sonography > Physics-Ch. 2 > Flashcards

Physics-Ch. 2 Flashcards

1
Q

Sound is what type of wave?

A

Mechanical

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2
Q

What is a longitudinal wave?

A

Sound waves

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3
Q

Acoustic propagation properties

A

The effects of the medium upon the sound wave

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4
Q

What are the biological effects?

A

The effects of the sound wave upon the biological tissue through which it passes.

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5
Q

Sound waves are identified by?

A

Acoustic variables

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6
Q

Name the three acoustic variables

A

Pressure
Density
Distance

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7
Q

What is pressure and the unit of pressure?

A

Concentration of force in an area

Pascals (pa)

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8
Q

What is density and the unit?

A

Concentration of mass in a volume

Kg/ cm^3

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9
Q

What is distance and the unit?

A

Measure of particle motion

Cm, feet, mile

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10
Q

What describes the waves features and how many are there?

A

Acoustic Parameters

Seven

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11
Q

What are the seven acoustic parameters?

A 
Period 
Frequency 
Amplitude
Power 
Intensity
Wavelength
Propagation speed
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12
Q

What kind of wave moves perpendicular to the direction that the wave propagates?

A

Transverse

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13
Q

What kind of wave moves in the same direction that the wave propagates?

A

Longitudinal wave

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14
Q

Which wave has their peaks occur at the same time and at the same location?

A

In phase wave

“In step”

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15
Q

What waves have their peaks occur at different times?

A

Out of phase

Out of step wave

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16
Q

When multiple beams arrive at an identical location at exactly the same time and waves lose their individual characteristics at that moment and combine to for a single wave is?

A

Interference

17
Q

When a pair of in phase waves results in the formation of a single wave of greater amplitude than either of its components & the resulting wave is larger than either of the components is what?

A

Constructive interference

18
Q

A pair of out of phase waves results in the formation of a single wave of lesser amplitude than at least one of its components & the resulting wave is smaller than one of its components it’s called?

A

Destructive interference

Sonography (3 decks)

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