Chapter 2

Question 1

A wave is a

Answer 1

traveling variation in one or more quantities, such as pressure.

Question 2

All waves carry _ from one location to another

Answer 2

Energy

Question 3

_ waves: particles move ina direction that is perpendicular to the direction that the wave propagates

Answer 3

Transverse

Question 4

Longitudinal or transverse wave: light

Answer 4

Transverse

Question 5

Longitudinal or transverse wave: Sound

Answer 5

Longitudinal

Question 6

AKA compression waves

Answer 6

Longitudinal

Question 7

_ waves: particles move in the same direction that the wave propagates

Answer 7

Longitudinal

Question 8

Sound is a _ wave in which particles in the medium vibrate back and forth from a fixed position

Answer 8

Mechanical

Question 9

Sound is created by

Answer 9

the vibration of a moving object

Question 10

Can sound travel in a vacuum

Answer 10

No

Question 11

When a sound wave travels through a medium, the molecules undergo a series of

Answer 11

Compressions and rarefactions

Question 12

Areas of increased pressure and density

Answer 12

Compressions

Question 13

Areas of decreased pressure and density

Answer 13

Rarefactions

Question 14

Sounds travels in _

Answer 14

A straight line

Question 15

the effects of the medium upon the sound wave

Answer 15

Acoustic Propagation properties

Question 16

the effects of the sound wave on the biologic tissue (medium)

Answer 16

Biological effects

Question 17

A sound wave is AKA

Answer 17

Acoustic wave

Question 18

_ are used to distinguish between sound waves and other types of waves:

Answer 18

Acoustic variables

Question 19

3 acoustic variables

Answer 19

Pressure
Density
Distance (particle motion/vibration)

Question 20

When an acoustic variable changes rhythmically in time, a _ is present

Answer 20

Sound wave

Question 21

Pressure

Answer 21

concentration of force in an area (force/area)

Question 22

Density

Answer 22

concentration of mass in a volume

Question 23

Distance

Answer 23

measure of particle motion

Question 24

Units for pressure

Answer 24

Pascals (Pa)

Question 25

Units for density

Answer 25

Kg/cm^3

Question 26

Units for distance

Answer 26

cm, mm

Question 27

Sound travels quickest in

Answer 27

Solid

Question 28

Sound travels slowest in

Answer 28

Gas

Question 29

_ waves: when the peaks (maximum values) and troughs (minimum values) of the two waves occur at the same time and same location

Answer 29

In-phase

Question 30

Out of phase waves

Answer 30

the peaks and troughs are at different times and locations, “out of step”

Question 31

_: when multiple sound beams are traveling in the same medium and arrive at the same location and time, they lose their individual characteristics and combine to form a single wave

Answer 31

Interference

Question 32

Constructive interference

Answer 32

Takes place with interference of in-phase waves

Results in a single wave of greater amplitude than either of its components

Question 33

Destructive interference

Answer 33

Results from interference of out-of-phase waves

Resultant wave is smaller than one of its components

Question 34

When two waves of equal amplitude, _ can occur

Answer 34

Complete destructive interference