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Ultrasound > Wave Characteristics And Sound Of Sound > Flashcards

Wave Characteristics And Sound Of Sound Flashcards

1
Q

There are measurable quantities that vary within a medium as sound propagates.

A

Acoustic Variables

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2
Q

It is the amount of force in a given area

A

Pressure

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3
Q

Relationships of amplitude, power and intensity:

  1. ) ⬆️ Power = ____ intensity
  2. ) ⬆️ Area = ____ density
  3. ) ⬇️ Area = ____ intensity
A
  1. )⬆️
  2. )⬇️
  3. ) ⬆️
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4
Q

It is the distance moves by the molecules in the medium

A

Particle motion

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5
Q

It is the power per unit area

A

Intensity

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6
Q

Relationships of amplitude, power and intensity:

When power increases = intensity _______

A

increases

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7
Q

It isbthe rate at which the work is done

A

Power

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8
Q

The easier a medium is to reduce in volume =

A

The higher its compressibility

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9
Q

It is the concentration of matter

A

Density

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10
Q

It is the speed at which sound moves through a medium

A

Speed propagation

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11
Q

It refers to the ability if an object to return to its original shape.

A

Elasticity

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12
Q

It is the mass per unit volume

A

Density

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13
Q

What is the relationship of the velocity of sound in amedium to density?

A

Inversely proportional

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14
Q

It is the concentration of heat energy

A

Temperature

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15
Q

On n the basis of density alone, sound wave have greater velocity in ____ than in _____.

A

air, bone

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16
Q

Relationships of amplitude, power and intensity:

When area decreases = intensity _______, why?

A

Increases, bc power is more concentrated

17
Q

What is the relationship of the velocity of sound through a medium to compressibility of the medium?

A

Inversely proportional

18
Q

It is the measure of how far variable gets away from its normal undistributed value

A

Amplitude

18
Q

Relationships of amplitude, power and intensity:

When area increases = density _______, why?

A

Decreases, bc power is less concentrated

20
Q

It is the reciprocal of compressibility

A

Bulk modulus

21
Q

It is the fraction of the incident intensity transmitted into the second medium

A

Intensity transmission coefficient

22
Q

What is the relationship of the velocity of sound through a medium to the bulk modulud of the medium?

A

Directky proportional

23
Q

When we combine the comressibility and density into an equation, we can determine?

A

Acoustic velocity

24
Q

Stiffer media have _______ sound speeds.

A

Higher

25
Q

Relation of acoustic impedance and refelction:

In substance with same Z, how much is the total transmission energy and is there any reflection?

A

Total transmission

There is no refelction

26
Q

How to get the propagation speed of sound?

A

C= wavelength x frequency

26
Q

The denser the medium = the ______ the propagation speed.

A

Lower

28
Q

It indicates tge fractional decreasevin the volume when pressure is apploed to the material

A

Compressibility (K)

30
Q

Relative measurement that compare value at one point to anoth er point. It is used to express a change in two values with same units.

A

Decibel

31
Q

It is the property of a substance, which describes how the particles of that substance behave when subjected to a spund wave

A

Acoustic Impedance

31
Q

Acoustc impedance is a product of?

A

Tissue density and speed of sound

31
Q

Relation of acoustic impedance and refelction:

In substance with small difference of Z, how much is the transmission energy and is there any reflection?

A

There is a little energy reflected but most of the energy is transmitted.

33
Q

It is the difference in acoustic impedance

A

Acoustic impedance mismatch

34
Q

Relation of acoustic impedance and refelction:

In substance with large difference in Z, how much is the transmission energy and is there any reflection?

A

There is a large amount of reflection and a little energy that is trasmitted

35
Q

It gives the proportion of energy reflected from an interface bet. two substances.

A

Intensity reflection Coefficient

36
Q

It is the resistance of a material to compression.

A

Stiffness

Ultrasound (3 decks)

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