Sound

Question 1

Sound waves are identified by _______ in acoustic variables.

Answer 1

Oscillations

Question 2

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

Answer 2

Pressure, density, distance

Question 3

All waves ________ from one location to another.

Answer 3

Carry energy

Question 4

Sound is a _______ wave in which particles in a medium move.

Answer 4

Mechanical

Question 5

Sound must travel through a medium where molecules are alternately __________ (squeezed together) and _________ (stretched apart).

Answer 5

Compressed, rarefied

Question 6

Sound travels in a _______ line.

Answer 6

Straight

Question 7

Sound waves are ________ waves.

Answer 7

Longitudinal

Question 8

The effects of the medium upon the sound wave.

Answer 8

Acoustic propagation properties

Question 9

The effects of the sound wave upon the biological tissue through which it passes.

Answer 9

Biologic effects

Question 10

Concentration of force in an area.

Answer 10

Pressure

Question 11

Units of pressure

Answer 11

Pascals (Pa)

Question 12

Concentration of mass in a volume

Answer 12

Density

Question 13

Units of density

Answer 13

Kg / cm^3

Question 14

Measure of particle motion

Answer 14

Distance

Question 15

Units of distance

Answer 15

Cm, feet, mile

Question 16

Sound waves are also known as

Answer 16

Acoustic waves

Question 17

Seven acoustic parameters that are used to describe the characteristics of a sound wave.

Answer 17

Period, frequency, amplitude, power, intensity, wavelength, propagation speed

Question 18

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

Answer 18

Transverse

Question 19

In a _______ wave, particles move in the same direction that the wave propagates.

Answer 19

Longitudinal

Question 20

A pair of waves who’s peaks occur at the same time and at the same location.

Answer 20

In-phase

Question 21

When two wave’s peaks occur at different times, and so do their troughs.

Answer 21

Out-of-phase

Question 22

When more than one sound beam travels in a medium, their beams arrive at an identical location at the same time, and their waves lose their individual characteristics at that moment to form a single wave.

Answer 22

Interference

Question 23

Interference of a pair of in-phase waves that results in the formation of a single wave of greater amplitude than either of its components.

Answer 23

Constructive interference

Question 24

Interference of a pair of out-of-phase waves resulting in the formation of a single wave of lesser amplitude than at least one of its components.

Answer 24

Destructive interference

Question 25

When two out-of-phase waves are of equal amplitude, this may occur…

Answer 25

Complete destructive interference

Question 26

Interesting phenomenon when waves of different frequencies interfere.

Answer 26

Both constructive and destructive interference

Question 27

What do waves transfer from one location to another?

Answer 27

Energy

Question 28

Which of the following best describes sound waves? A. A series of compressions and rarefactions 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

Answer 28

A. Sound waves are a series of compressions and rarefactions

Question 29

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

Answer 29

D. Wide molecular spacing

Question 30

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

Answer 30

B. Parameters

Question 31

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

Answer 31

C. They are transverse

Question 32

All of the following are acoustic parameters except… A. Pressure B. Period C. Propagation speed D. Frequency

Answer 32

A. Pressure

Question 33

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 33

D. Longitudinal, pressure waves

Question 34

Two waves are traveling in a medium and arrive at a location at the same time. What event takes place?

Answer 34

Interference

Question 35

Which types of waves will exhibit both constructive and destructive interference?

Answer 35

Waves of different frequency

Question 36

What units are used to report the pressure of a sound beam?

Answer 36

Pascals

Question 37

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

Answer 37

True

Question 38

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

Answer 38

True