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Ultrasound > Wave Characteristics > Flashcards

Wave Characteristics Flashcards

1
Q

Greek word for hearing

A

Acoustic

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2
Q

Measurable quantities that vary within a medium as a sound propagates through the medium

A

Acoustic variable

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3
Q

Acoustic variables

A

Pressure
Density
Particle motion
Temperature

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4
Q

Force in a given area

A

Pressure

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5
Q

Unit of force

A

Pascal (Pa)

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6
Q

Other units for pressure

A

Pounds per square inch

N/m2

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7
Q

Concentration of matter

Mass per unit volume

A

Density

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8
Q

Unit for density

A

Kg/cm3

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9
Q

Concentration for heat energy

A

Temprature

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10
Q

Unit for temp

A

Degrees fahrenheit
Celsius
Kelvin

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11
Q

Distance moved by the molecules in the medium

A

Particle motion

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12
Q

Unit for distance/particle motion

A

Nanometer

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13
Q

Two most widely used acoustic variable

A

Pressure

Density

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14
Q

Rayles

A

Kg/ms2

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15
Q

Maximum variation

Measure how far variable gets away

A

Amplitude

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16
Q

Rate at which work is done

A

Power

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17
Q

Unit for power

A

Watts

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18
Q

Power per unit mass

A

Intensity

19
Q

Unit for intensity

A

W/cm2

20
Q

Intensity =

A

Power/area

21
Q

The higher the frequency, _______ the volume

A

Stable

22
Q

Speed at which sound moves throuh a medium

A

Propagation speed

23
Q

Speed =

A

Wavelength x frequency

24
Q

Unit for propagation speed

A

Meters per second

25
Q

Sound propagation properties

A

Elasticity
Density
Bulk modulus
Compressibilty

26
Q

Ability of an object to return to its original shape

A

Elasticity

27
Q

Mass per unit volume

A

Density

28
Q

Symbol used in density

A

Rho (p)

29
Q

Velocity is ____________ to thr square of density

A

Inversely proportional

30
Q

Fractional decrease in volume when pressure is applied

A

Compressibility

31
Q

Velocity of sound is _______ to the squaee root of compressibility

A

Inversely proportional

32
Q

Symbol for compressibility

A

K

33
Q

Reciprocal of compressibility

A

Bulk modulus

34
Q

Bulk modulus is _______ to the velocity of sound

A

Proportional

35
Q

Compressibility is also known as

A

Stiffness

36
Q

Resistance of the material to compression

“Hardness”

A

Stiffness

37
Q

Relative measurement that compare value at one point

A

Decibels (dB)

38
Q

Decibel is also known as

A

Relative scale

39
Q

The decibel scale is ________ of the bel scale

A

1/10th

40
Q

Scale is the “bel” scale is named after

A

Alexander Graham Bell

41
Q

It is a logarithmic scale

A

Decibel

42
Q

Useful in expressing data that covers a wide range of values

A

Logarithmic scale

43
Q

Abbreviation of logarithm

A

Log

44
Q

The number of tens that must be multiplied together that result in that number

A

Logarithm

Ultrasound (6 decks)

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