Brainscape's Knowledge GenomeTM

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


See full index

SPI > Describing Sound Waves > Flashcards

Describing Sound Waves Flashcards

1
Q

What are parameters?

A

They describe features of a sound wave.

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

What are the seven parameters?

A
  1. Period
  2. Frequency
  3. Propagation speed
  4. Wavelength
  5. Amplitude
  6. Power
  7. Intensity
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is a period?

A

It is the time it takes a wave to complete a single cycle.

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

What units is period reported in?

A

Units of time.

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

What is the period determined by?

A

Determined by the sound source only.

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

Is the period adjustable?

A

No.

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

What is frequency?

A

It is the number of events that occur in a specific duration of time.

The number of cycles that occurs in one second.

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

What unit is frequency reported in?

A

Reported in units of per second.

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

What is frequency determined by?

adjustable?

A

It is determined by the sound source only and it is not adjustable.

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

What is considered below the threshold of human hearing?

A

A frequency of a sound wave less than 20 Hz.

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

What is the name for sound waves that have a frequency lower than 20 Hz?

A

Infrasound.

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

What frequency range can humans hear?

A

Between 20 Hz and 20,000 Hz

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

Why is frequnecy important in diagnostic sonography?

A

It is important because it affects the penetration and image quality.

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

What is the relationship between frequency and period?

A

Inversely related.

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

What is the equation for period?

A

Period= 1/F

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

What frequency is audible?

A

Between 20 Hz and 20 kHz

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

What frequency is ultrasound?

A

Greater than 20 kHz

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

What are the 3 “bigness” parameters that describe the size, magnitude, or strength of a sound wave?

A
  1. Amplitude
  2. Power
  3. Intensity
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What is amplitude?

A

It is the bigness of a wave.

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

What is the amplitude determined by?

A

It is determined by the sound source only.

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

What happens to amplitude as it travels through a medium?

A

It decreases as sound propagates.

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

Is amplitude adjustable?

A

Yes.

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

What is power?

A

It is the rate at which work is performed.

24
Q

What is power determined by?

A

It is determined by the sound source only.

25
Q

What happens to power as ir travels through the body?

A

Like amplitude, it decreases as sound propagates through the body.

26
Q

Is power adjustable?

A

Yes.

27
Q

How are power and amplitude related?

A

Directly related.

Power ≈ amplitude2

28
Q

What is intensity?

A

It is the concentration of energy in a sound beam.

29
Q

How do you calculate intensity?

A

Divide the the beams power by the beam’s area.

intensity (W/cm2)=Power (w)/area (cm2)

30
Q

What does intensity relate to?

A

It relates to how the power in a wave spreads or is distributed in space.

31
Q

What is the unit of intensity?

A

W/cm2

32
Q

What is whats determined by?

A

initial intensity is determined by the sound source only.

33
Q

Is intensity adjustable?

A

Yes.

34
Q

How is intensity related to power?

A

It is directly proportional.

35
Q

How is intensity related to power?

A

It is directly proportional to the waves amplituded squared.

36
Q

What is wavelength?

A

It is the distance of one complete cycle.

37
Q

What is the unit of wavelength?

A

It is measured in units of length.

38
Q

What is the wavelength determined by?

A

Both sound source and medium.

39
Q

Can wavelength be adjusted?

A

No.

40
Q

What is the only parameter that is determined by both the sound source and medium?

A

Wavelength.

41
Q

What is the relationship between wavelength and frequency?

A

Inversely related

42
Q

What is the wavelength of 1 MHz sound in soft tissue?

A

1.54mm

43
Q

What is the equation for wavelength?

A

wavelength (mm)= 1.54 (mm/us) / frequency (MHz)

44
Q

What type of wavelength creates a better and clearer image?

A

Shorter wavelength because it is created by higher frequencies.

45
Q

What is propagation speed?

A

It is the rate at which a sound wave travels through a medium.

46
Q

What is the unit of speed?

A

It is measured in used of distance/time

47
Q

What is speed determined by?

A

Speed is determined by the medium.

48
Q

Can speed be adjusted?

A

No.

49
Q

What is the speed of sound in soft tissues?

A

1540 m/s

50
Q

What is the equation for speed?

A

Speed (m/s)= frequency (Hz) x wavelength (mm)

51
Q

What characteristics of a medium determine the speed of sound in that medium?

A

stiffness and density.

52
Q

What is stiffness?

A

It is the ability of an object to resist compression.

53
Q

How does stiffness affect speed?

A

They are directly related.

*As materials become stiffer, the speed of sound in the material increases.

54
Q

What is density?

A

Describes the weight of a material.

55
Q

How does density affect speed?

A

Density and speed are inversely related.

* As materials become more dense, the speed of sound decreases.

SPI (5 decks)

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