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Basic Ultrasound Physics > Sound > Flashcards

Sound Flashcards

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1
Q

Waves carry ______ from one location to another.

A

energy

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2
Q

True or False: Sound is a mechanical wave in which particles in a medium move

A

True

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3
Q

Define acoustic propagation properties

A

Effects of medium upon sound wave

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4
Q

What is an example of an acoustic propagation property?

A

Attenuation

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5
Q

Define Biological effects (bioeffects)

A

The effects of the sound wave on the tissue

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6
Q

True or False: Sound can travel through a vaccum

A

False

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7
Q

Sound waves require a ______.

A

medium

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8
Q

When molecules are squeezed together they are ________.

A

compressed

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9
Q

When molecules are stretched apart they are _______.

A

rarified

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10
Q

Sound travels in a _______ line.

A

straight

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11
Q

True or False: Sound waves are longitudinal waves

A

True

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12
Q

Define Acoustic Variables

A

Changes that occur within a medium as a result of sound propagation

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13
Q

Sound waves are also known as ______ waves.

A

acoustic

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14
Q

Name the three acoustic variables?

A

pressure, density, distance (particle motion)

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15
Q

Define pressure and its units

A

Concentration of force in an area; pascals (Pa)

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16
Q

Define density and its units

A

Concentration of mass in a volume; kg/cm^3

17
Q

Define distance and its units

A

Measure of particle motion; cm, feet, mile

18
Q

How many acoustic variables are required to be considered a sound wave?

A

One

19
Q

What is used to describe a sound wave?

A

Acoustic parameters

20
Q

Why are transverse waves not diagnostic?

A

Particles move in a direction that is perpendicular to the direction of wave propagation

21
Q

In a longitudinal wave, particles move in the ______ direction that the wave propagates.

A

same

22
Q

In-phase waves have peaks and troughs that occur at ______ time.

A

same

23
Q

Out of phase waves have peaks and troughs that occur at _____ times.

A

different

24
Q

The combination of sound waves is called?

A

interference

25
Q

When waves have constructive interference, the final amplitude is ______ .

A

greater

26
Q

When waves have destructive interference, the final amplitude is ______.

A

smaller

27
Q

In what type of interference do waves completely cancel each other out?

A

Complete destructive interference

Basic Ultrasound Physics (6 decks)

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