Chapter 2: sound

Question 1

Sound only travels through ____

Answer 1

Media

Question 2

soft tissue

Answer 2

body

Question 3

All waves

Answer 3

carry energy from one location to another

Question 4

sound is what kind of wave?

Answer 4

Mechanical; in which the particles in the medium move.

Question 5

compressed

Answer 5

squeezed together

Question 6

rarefied

Answer 6

stretched apart

Question 7

sound cannot travel through

Answer 7

a vacuum

Question 8

sound travels in a _______ line

Answer 8

straight

Question 9

sound waves are ________ waves

Answer 9

longitudinal

Question 10

acoustic propagation properties

Answer 10

The effects of the medium upon the sound wave

Question 11

biologic effects

Answer 11

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

Question 12

pressure

Answer 12

concentration of force in an area.

Question 13

pascals (Pa)

Answer 13

pressure

Question 14

Density

Answer 14

concentration of mass in a volume.

Question 15

kg/cm^3

Answer 15

density

Question 16

distance

Answer 16

measure of particle motion.

Question 17

cm, feet, mile

Answer 17

units of distance

Question 18

oscillation

Answer 18

to move back and forth at a regular speed

Question 19

Three acoustic variables used to distinguish between sound waves and other types of waves.

Answer 19

pressure, density, and distance

Question 20

7 acoustic parameters used to describe sound waves

Answer 20

-period
-frequency
-amplitude
-power
-intensity
-wavelength
-propagation speed

Question 21

All waves ____ from one location to another

Answer 21

energy

Question 22

Sound waves are ____ in which particles in the medium move back and forth from a fixed position

Answer 22

mechanical

Question 23

Transverse Wave

Answer 23

particles move in a perpendicular direction to the direction the wave propagates

Question 24

If one of these acoustic variables has ______ then the wave is a sound wave

Answer 24

rhythmic oscillations

Question 25

Sound waves

Answer 25

acoustic waves

Question 26

In-phase waves

Answer 26

peas and valleys occur at the same time in both waves. "in step"

Question 27

Out-of-phase waves

Answer 27

occur when peaks and valleys occur at different times.` "out of step"

Question 28

Both in phase and out-of-phase can undergo

Answer 28

interference

Question 29

Interference

Answer 29

occurs when the waves lose their individual characteristics at that moment and combine to make a single wave.

Question 30

constructive interefence

Answer 30

resulting wave is larger than either component

Question 31

destructive interference

Answer 31

resulting wave is smaller than either component

Question 32

what do waves transfer from one location to another? a. matter b. molecules c. energy d. water

Answer 32

C. energy

Question 33

which of the following best describes sound waves? A. a series of compressions and rarefactions B. waves that are heard by man C. movements of molecules and energy from one location to another D. waves that used to make images of anatomy

Answer 33

A. a series of compressions and rarefactions

Question 34

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

Answer 34

D. wide molecular spacing

Question 35

Variations in all of the following identify specific waves as acoustic waves EXCEPT: A.Pressure B. Parameters C. Density D. Acoustic variables

Answer 35

B. Parameters

Question 36

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

Answer 36

C. sound waves are longitudinal

Question 37

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

Answer 37

A. pressure it is an acoustic variable not a parameter

Question 38

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

Answer 38

D. longitudinal, pressure waves

Question 39

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

Answer 39

C. interference

Question 40

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

Answer 40

c. both constructive and destructive interference occurs with waves at different frequencies.

Question 41

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

Answer 41

C. Pascals. Pressure is appropriately reported with units of Pa.

Question 42

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

Answer 42

True

Question 43

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

Answer 43

True.