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Physics Flashcards > Chapters 1-4 and 8 > Flashcards

Chapters 1-4 and 8 Flashcards

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0
Q

A change in one is always accompanied by a change in another.
(directly proportional)

A

Related or Proportional

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1
Q

A change in one is always accompanied by a change in the other.

A

Directly Proportional

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2
Q

One variable increases while the other decreases.

A

Inversely Proportional

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3
Q

A mutual interchange between two variables.

A

Reciprocal Relationship

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4
Q

potential biologic consequences due to the interaction between the ultrasound wave and the scanned tissue

A

Biologic Effects

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5
Q

Concentration of force

A

Pressure

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6
Q

Concentraion of mass or weight

A

Density

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7
Q

Measure of particle motion.

A

Distance

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8
Q

Molecules vibrate at 90 degrees to the direction of energy level.

A

Transverse Wave

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9
Q

Molecules vibrate in the same direction as the energy travels.

A

Longitudinal Wave

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10
Q

Two waves are paired such that maximum displacements occur at the same time and so reinforce.

A

In-Phase Wave

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11
Q

Two waves interfere and cancel eachother out, producing the out wave that has no wave length or amplitude

A

Out-of-Phase wave

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12
Q

adding two waves together to get a resulting wave that is bigger than the beginning wave.

A

Constructive Interference

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13
Q

When the sum of two waves is less than or equal to zero.

A

Destructive Interference

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14
Q

transducer

A

Source

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15
Q

An intervening substance through which something else is transmitted or carried on.

A

Medium

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16
Q

The time of the cycle

A

Period

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17
Q

Number of cycles per second that a periodic event or function undergoes.
Number of cycles completed per unit of time.

A

Frequency

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18
Q

Strength of an ultrasound wave measured in decibels

A

Amplitude

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19
Q

Rate of energy flow over the entire beam of sound.

Rate at which energy is transmitted.

A

power

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20
Q

Power per unit area

A

Intensity

21
Q

Distance over which a wave repeats itself during one period of oscillation.

A

Wavelength

22
Q

The speed at which the cycles travel.

A

Propagation Speed

23
Q

the concentration of matter.

A

Density

24
Q

The resistance of material to compression

A

Stiffness

25
Q

A collection of cycles that travel together.

A

Pulsed Sound

26
Q

The time intercal required for generating the transmitted pulse.

A

Pulse Duration

27
Q

The distance a pulse occupies in space

A

Spatial Pulse Length

28
Q

the time from the start of one pulse to the start of the next pulse.

A

Pulse Repitition Period

29
Q

In pulse-echo instruments, the number of pulses launched per second by the transducer.

A

Pulse Repetition Frequency

30
Q

Percentage of time that the system is trasnmitting a pulse.

A

Duty Factor

31
Q

The length or distance that an entire pulse occupies in space.

A

Spatial

32
Q

The highest or maximum point of anything.

A

Peak

33
Q

typical amount, rate, degree…

quantity intermediate to a set of quantities.

A

Average

34
Q

Ability of the system to accurately depict motion

A

Temporal

35
Q

In continuous wave ultrasound cycles repeat continuously.

A

Pulsed

36
Q

Unit used to quantitatively express the ratio of two amplitudes or intensities

A

Decibel (dB)

37
Q

Reduction in the amplitude and intensity of a sound wave as it propagates through a medium.

A

Attenuation

38
Q

reflection on either smooth or rough surfaces.

A

Reflection-Specular & Diffuse

39
Q

The process in which electromagnetic radiation or particles are deflected or diffused.

A

Scattering

40
Q

elastic scattering of light or other electromagnetic radiation by particles much smaller than the wavelength of the radiation.

A

Rayleigh Scattering

41
Q

a reduction of the intensity of any form of radiated energy as a result of energy conversion in a medium.

A

Absorption

42
Q

The fraction of an incident beam of photons that is absorbed or scattered per unit of thickness.

A

Attenuation Coefficient

43
Q

thickness of the material at which the intensity of radiation entering is reduced by one half.

A

Half Value Layer Thickness

44
Q

the effective resistance of an electric circuit or component to alternating current.

A

Impedance

45
Q

condition in which a wave-front is parallel to an interface

A

Normal Incidence

46
Q

The reflectivity of an interface between two media when the direction of propagation of the incident electromagnetic radiation is not perpendicular to the interface.

A

Oblique Incidence

47
Q

Change in the direction of propagation of a sound wave transmitted across an interface where the speed of sound varies.

A

Refraction

48
Q

the relationship between the angles of incidence and refraction for a wave impinging on an interface between two media with two different incidices.

A

Snell’s Law

49
Q

an equation used to solve the range of projectile motion.

A

Range Equation

50
Q

For every 13 microseconds, the object creating the reflection is 1 cm deeper in soft tissue.

A

13 Microsecond Rule

51
Q

A measure of a materials resistance to the propagation of sounds

A

Acoustic Propagation Properties

Physics Flashcards (6 decks)

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