Brainscape's Knowledge GenomeTM

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


See full index

Physics 1 > Test 1 > Flashcards

Test 1 Flashcards

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

What is the average velocity of ultrasound in soft tissue?

A

1.54 mm/microseconds

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

Propagation speed though a medium is primarily dependent on the _________________.

A

Stiffness

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

If sound waves of 3 MHz, 5 MHz, and 10 MHz are transmitted through the same section of liver, which signal would reach its target first?

A

Reflections from all three frequencies would have identical transit times.

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

In DMS, what is a period?

A

The time required to complete one wavelength

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

Which factor can NOT be controlled by the sonographer, either directly or indirectly?

A) propagation speed
B) amplitude
C) period
D) frequency

A

Propagation speed cannot be controlled by the sonographer

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

What is the unit for acoustic impedance?

A

Rayl’s

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

What is the unit for frequency?

A

Megaheartz

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

What is the unit for wavelength?

A

Millimeter

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

What is the unit for period?

A

Microsecond

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

What is the unit for power?

A

Watts

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

What is the unit for propagation speed?

A

Meter/Second

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

Rarefaction describes a region of _________ along the wave.

A

low pressure

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

What is the wavelength of a 3MHz ultrasound beam?

A

0.5 mm

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

When particle motion of a medium is parallel to the direction of the wave propagation, the wave being transmitted is called:

A

Longitudinal

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

In DMS, what is the period if the frequency is 2 MHz?

A

0.5 μm

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

What is 6 micrometers in scientific notation?

A

6 x 10^-6

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

What is equal to 5 mm in km?

A

0.000005

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

What describes sound propagations through a vacuum?

A

Sound cannot travel through a vacuum

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

What term describes the distance between the compression zones?

A

Wavelength

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

What is the formula for acoustic impedance?

A

density x propagation speed

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

(True/False)

Two waves that interact with each other will always cause destructive interference

A

False

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

Finish the Statement:

When frequency increases the resolution (blank)
and the ability of the beam to penetrate the medium (blank)

A

When frequency increases the resolution improves
and the ability of the beam to penetrate the medium decreases

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

Finish the Statement:

When frequency decreases, the period (blank)
and the wavelength (blank).

A

When frequency decreases, the period increases
and the wavelength increases

24
Q

How many crystals are in a continuous wave transducer?

A

two

25
Q

In diagnostic medical sonography, what will happen to the density if the frequency is doubled?

A

Density is not affected by frequency

26
Q

What is the frequency if the period is 0.16 μs?
round to the nearest whole number

A

6 MHz

(Note: do not forget to write the unit)

27
Q

What is one Hertz equal to per second?

A

One cycle per second

28
Q

What is the term for any sound that is less than audible sound?

A

Infrasound

29
Q

(True/False)

Wavelength and period are measuring the same portion of a wave just with different units.

A

True

30
Q

What is the wavelength if you have a period of 0.25 microseconds?
round your answer to 2 decimal places

A

0.39 mm

(Note: do not forget to include the unit)

31
Q

List the ultrasound velocity in biological tissues in order of slowest to fastest:

Tissues named: (not in order)
Bone
Fat
Blood
Air
Soft tissue

A

air, fat, soft tissue, blood, bone

32
Q

What happens to the intensity if the amplitude is increased by a factor of 3?

A

The intensity would be increased by a factor of 9

33
Q

What happens to the intensity if the area is decreased by a factor of two and all other factors are unchanged?

A

The intensity would be increased by a factor of 2

34
Q

What type of relationship is there between wavelength and period?

A

Proportional

35
Q

In DMS, what is amplitude?

A

Amount of change between the maximum and average
values for a variable.

36
Q

In DMS, approximately how fast can sound travel in 20 μsec?

A

3 cm

37
Q

3 kHz is equal to how many MHz?

A

0.003 MHz

38
Q

(True/False)

Elasticity is a materials ability to be conformed when a force is applied to it.

A

False

39
Q

(True/False)

Acoustic impedance is a property of the medium

A

True

40
Q

Ultrasound is a sound with a frequency greater than (blank) Hz

A

20,000

41
Q

Which of the following frequencies is in the ultrasound range?

A. 15 Hz
B. 15 kHz
C. 30,000 Hz
D. 15,000 Hz

A

C. 30,000 Hz

42
Q

Name three acoustic variables

A

Particle motion
Density
Pressure

43
Q

Frequency is the number of (blank) an acoustic variable goes through in a second

A

Cycles

44
Q

The unit of frequency is (blank), abbreviated as (blank)

A

Hertz, (Hz)

45
Q

Period is the (blank) that it takes for one cycle to occur

A

Time

46
Q

Period decreases while (blank) increases

A

Frequency

47
Q

Wavelength is the length of (blank) over which one cycle occurs

A

Space

48
Q

Propagation speed is the speed with which a(n) (blank) moves through a medium

A

Wave

49
Q

Wavelength is equal to (blank) divided by (blank)

A

propagation speed / frequency

50
Q

The average propagation speed in soft tissues is ______m/s or ______mm/microsecond

A

1540 m/s or 1.54 mm/microsecond

51
Q

Propagation speed is determined by the (blank)

A

Medium

52
Q

Wavelength un soft tissues (blank) while frequency increases

A

Decreases

53
Q

Sound is a (blank) , (blank) wave

A

Mechanical, longitudinal wave

54
Q

From given values for propagation speed and frequency, (blank) can be calculated

A

Wavelength

55
Q

Period equals (blank) divides by (blank)

A

of cycles divided by the frequency

56
Q

Frequency = (blank) divided by (blank)

A

of cycles divided by the period

57
Q

Phrase to remember scientific notation

A

Endless — Exto 12
Gossip — Giga 9
My — Mega 6
King — Kilo 3
Henry — Hecto 2
Died — Deka 1
By — base
Drinking — Deci -1
Chocolate — Centi -2
Milk — milli -3
My — micro -6
Nana — nano -9
Poisoned — pico -12

Physics 1 (5 decks)

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