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Intro > Ch. 2 Sound > Flashcards

Ch. 2 Sound Flashcards

1
Q

All waves carry _______ from one location to another.

A

All waves carry energy from one location to another

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2
Q

Sound is a ___________________ wave, in which particles in the medium move

A

Sound is a mechanical wave, in which particles in the medium move

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3
Q

Sound cannot travel though a ________________________, it must travel through a medium

A

Sound cannot travel through a vacuum it must travel through a medium

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4
Q

When sound travels through a medium, molecules are alternately _______________________ and ____________________

A

When sound travels through a medium, molecules are alternately compressed (squeezed together) and rarefied ( stretched apart)

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5
Q

Sound travels in a ________________ line

A

Sound travels in a straight line

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6
Q

Sound waves are _______________________ waves

A

Sound waves are longitudinal waves

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7
Q

______________ ______________________ ________________ are the effects of the medium upon the sound wave

A

acoustic propagation properties are the effects of the medium upon the sound wave

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8
Q

__________________ effects are the effects of the sound wave upon the biologic tissue through which it passes

A

Biologic effects are the effects of the sound wave upon the biologic tissue through which it passes

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9
Q

What are the 3 acoustic variables?

A
  1. Pressure
  2. Density
  3. Distance
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10
Q

_____________________ is the concentration of force in an area

A

pressure is the concentration of force in an area

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11
Q

___________________ is concentration of mass in a volume

A

density is concentration of mass in a volume

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12
Q

______________________ is the measure of particle motion

A

distance is the measure of particle motion

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13
Q

What are the units of pressure?

A

Pascals (Pa)

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14
Q

What are the units of density?

A

kg/mL and kg/cm^3

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15
Q

What are the units of distance?

A

cm, feet, mile, mm, etc.

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16
Q

Sound waves are also known as _______________________ waves

A

Sound waves are also known as acoustic waves

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17
Q

What are the 7 acoustic parameters?

A
  1. Period
  2. Frequency
  3. Amplitude
  4. Power
  5. Intensity
  6. Wavelength
  7. Propagation speed
18
Q

In a ______________________wave, particles move in a direction that is perpendicular to the direction that the wave propagates

A

In a transverse wave particles move in a direction that is perpendicular to the direction that the wave propagates

19
Q

In a ___________________________ wave particles move in the same direction that the wave propagates

A

In a longitudinal wave particles move in the same direction that the wave propagates

20
Q

A pair of waves are considered _________________ when their peaks (maximum values) occur at the same time and at the same location.

A

A pair of waves are considered in-phase when their peaks (maximum values) occur at the same time and at the same location

21
Q

When two waves are _______________________ their peaks occur at different times, and so do their troughs.

A

When two waves are out-of-phase their peaks occur at different times, and so do their troughs.

22
Q

When on occasion, multiple beams arrive in an identical location at the same time the waves loose their individual characteristics and form a single wave: this combination is called ______________________________

A

When on occasion, multiple beams arrive in an identical location at the same time the waves loose their individual characteristics and form a single wave: this combination is called Interference

23
Q

Both in-phase and out-of-phase wave pairs undergo ______.

A

interference; however they combine differently

24
Q

A pair of in-phase waves results in the formation of a single wave of greater amplitude than either of its components. This combination is called ________________________ interference.

A

A pair of in-phase waves results in the formation of a single wave of greater amplitude than either of its components. This combination is called constructive interference

25
Q

______________________ interference is where the resulting wave is larger than either of its components

A

constructive interference is where the resulting wave is larger than either of its components

26
Q

A pair of out-of-phase waves results in the formation of a single wave of lesser amplitude than at least one of its components. This combination is called _________________________ interference.

A

A pair of out-of-phase waves results in the formation of a single wave of lesser amplitude than at least one of its components. This combination is called destructive interference

27
Q

__________________________ interference is where the resultant wave is smaller than one of its components

A

destructive interference is where the resultant wave is smaller than one of its components

28
Q

When two out-of-phase waves are of equal amplitude, _______________________ _______________________ interference may occur

A

When two out-of-phase waves are of equal amplitude, complete destructive interference may occur

29
Q

What do waves transfer from one location to another?
A. matter
B. molecules
C. energy
D. water

A

C. waves carry energy from place to place

30
Q

Which of the following best describes sound waves?
A. a series of compression’s and rarefractions
B. waves that are heard by man
C. movement of molecules and energy from one location to another
D. waves that are used to make images of anatomy

A

A. sound waves are a series of compressions and rarefactions

31
Q

Which of the following terms does not belong with the others?
A. compression
B. region of high density
C. region of high pressure
D. wide molecular spacing

A

D does not belong

32
Q

Variations in all of the following identify specific waves as acoustic waves except:
A. pressure
B. parameters
C. density
D. acoustic variables

A

B parameters

33
Q

All of the following are true of sound waves except:
A. they are acoustic
B. they are pressure waves
C. they are transverse
D. they move energy

A

C. sound waves are longitudinal, not transverse

34
Q

All of the following are acoustic parameters except:
A. pressure
B. period
C. propagation speed
D. frequency

A

A. pressure is an acoustic variable, not a parameter

35
Q

Which of the following best describes sound waves?
A. transverse, pressure waves
B. transverse, longitudinal waves
C. longitudinal waves, out-of-phase waves
D. longitudinal, pressure waves

A

D. longitudinal, pressure waves best describe sound waves

36
Q

Two waves are traveling in a medium and arrive at a location at the same time. What event takes place?
A. constructive interference
B. destructive interference
C. interference
D. reflection

A

C. When two waves are traveling in a medium and arrive at a location at the same time. Interference takes place

37
Q

Which types of waves will exhibit both constructive and destructive interference?
A. waves of different amplitude
B. a pair of longitudinal waves
C. waves of different frequency
D. out-of-phase waves

A

C. both constructive and deconstruction interference occurs with waves with different frequencies

38
Q

What units are used to report the pressure of a sound beam?
A. pounds
B. centimeters
C. pascals
D. kg/cm

A

C. pressure is appropriately reported with units of pascals, abbreviated Pa

39
Q

True or False? Acoustic variables allow us to determine which waves are sound waves and which are not.

A

True

40
Q

True or False? Acoustic parameters are used to describe the features of sound waves

A

True

Intro (26 decks)

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