Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Physics I > Physics Soundwaves Test Study Guide > Flashcards

Physics Soundwaves Test Study Guide Flashcards

You may prefer our related Brainscape-certified flashcards:
Physics 101 flashcards AP® Physics flashcards
1
Q

_______ _______ = The measure of resistance to sound traveling through a medium

A

Acoustic impedance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

_______ of _______ = The angle from normal at which the sound beam strikes and interface

A

Angle of incidence

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

_______ = Encompasses absorption, scattering, divergence and reflection

A

Attenuation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

_______ = Units of measure are w/cm^2

A

Intensity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

_______ = Normally the dominant contribution to attentuation

A

Absorption

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

_______ = The concentration of energy in a sound beam

A

Intensity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

_______ or _______ = Relates to the strength of the sound beam

A

Amplitude/Power

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

_______ = The junction of two media with different acoustic properties

A

Interface

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

_______ = The conversion of sound to heat

A

Absorption

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

_______ = Units of measure are Watts or milliwatts

A

Power

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

_______ = Equals the maximum variation of an acoustic variable

A

Amplitude

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

_______ _______ = A sound beam intersects a smooth surface larger than the width of the beam at < 90

A

Oblique incidence

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

_______ = Limits imaging depth and must be compensated for

A

Attenuation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

_______ = Rate at which energy is transmitted

A

Power

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

_______ = The spreading out of a beam that results from a source of small physical dimensions

A

Divergence

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

_______ = The decrease in strength/intensity as a beam traverses a medium

A

Attenuation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Frequency is a measure of how many _______ an acoustic variable goes through in a second.

A

cycles

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

The unit of frequency is the _______, which is abbreviated _______

A

Hertz

Hz

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Period is the _______ that it takes for one cycle to occur

A

time

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Period is one divided by _______

A

frequency

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Wavelength is the _______ over which one cycle occurs

A

space

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Wavelength is equal to _______ _______ divided by _______

A

Propagation speed

frequency

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

The average propagation speed in soft tissues is _______ m/s or _______ mm/microseconds

A

1,540

1.54

24
Q

Propagation speed is determined by _______

A

medium

25
Q

Length of time to complete one cycle

A

period

26
Q

Time of the start of one cycle to the start of the next cycle.

A

period

27
Q

Attenuation is the reduction of _______/_______ as the wave travels through a medium.

A

Strength

Intensity

28
Q

If power is doubled, and area remains unchanged, Intensity is _______

A

doubled

29
Q

If amplitude is doubled, and area remains unchanged, power is _______

A

quadrupled

30
Q

BONUS: What is the formula describing temporal resolution and its relationship with the depth and other factors that effect the pulse repetition frequency.

A

P x LPF x FR x NF < (line below less then sign because its less than or equal to) 77,000

31
Q

List four factors affecting the strength of a reflected echo

A

1) The degree of acoustic impedance mismatch
2) Inherent strength of the incident ultrasound beam
3) The angle at which the US beam strikes a reflecting surface
4) Size of the reflector

32
Q

_______ _______ = The measure of resistance to sound traveling through a medium

A

Acoustic Impedance

33
Q

BONUS: In oblique incidence, the angle of reflection _______ the angle of incidence

A

Equals

34
Q

As density increases, impedance _______

A

increases

35
Q

Bone = _______ Rayls
Soft Tissue = _______ Rayls
Fat = _______ Rayls
Lung = _______ Rayls

A
  1. 8
  2. 63
  3. 38
  4. 26
36
Q

In perpendicular incidence, the angle of reflection _______ the angle of incidence

A

Equals

37
Q

A decrease in impedance difference will result in a _______ in transmitted sound

A

increase

38
Q

As propagation speed decreases, impedance _______

A

decreases

39
Q

To obtain maximum detection of the reflected signal, we must orient the transducer so the generated sound beam will strike a interface _______

A

perpendicular

40
Q

Smooth interfaces, larger than the beam width _______ (specular reflector or scatterer)

A

Specular reflector

41
Q

Very frequency dependant

A

scatterer

42
Q

Tiny, punctate reflectors that scatter a small portion of the beam in almost all directions

A

scatterer

43
Q

Produce high-intensity, unidirectional reflections

A

specular

44
Q

Provide the US texture within organs

A

scatterer

45
Q

Very angle dependant

A

specular

46
Q

These are responsible for major organ outline as seen by US; i.e., diaphragm

A

specular

47
Q

RBCs are a specific type

A

scatterer

48
Q

Transducer type: Mechanical = _______ Image shape

A

Sector

49
Q

Transducer Type: Linear Switched/Sequenced = _______ Image shape

A

Rectangular

50
Q

Transducer type: Linear Phased = _______ Image shape

A

sector

51
Q

Transducer Type: Annular Phased = _______ Image shape

A

sector

52
Q

Transducer Type: Convex Sequential = _______ Image shape

A

Blunted sector

53
Q

Transducer Type: Convex Phased = _______ Image shape

A

Blunted sector

54
Q

Transducer Type: Vector = _______ Image shape

A

Flat top sector

55
Q

The imaging depth ______ as frequency increases

A

decreases

56
Q

Attenuation consists of _______, _______, and _______

if its a fourth option then it would be ________

A

absorption
scattering
divergence
reflection

57
Q

If frequency is doubled and path length is halved, attention __________

A

remains the same

Physics I (8 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions