Ch.3 Physics

Question 1

Hz is per

Answer 1

second

Question 2

Period has an inverse/reciprocal relationship with

Answer 2

frequency

Question 3

Describes features of a sound wave

Answer 3

parameters

Question 4

Time it takes a wave to vibrate in a single cycle

Answer 4

period

Question 5

Units for period

Answer 5

time

Question 6

Period is determined by

Answer 6

sound source

Question 7

Is period adjustable

Answer 7

no

Question 8

What is the source of a sound wave

Answer 8

ultrasound system and transducer

Question 9

Number of particular events that occur in a specific duration of time

Answer 9

Frequency

Question 10

Frequency is reported in

Answer 10

units per second, hertz

Question 11

Typical value for frequency

Answer 11

2-15 MHz

Question 12

Frequency is determined by

Answer 12

sound source

Question 13

Is frequency adjustable

Answer 13

no

Question 14

Frequency of infrasound

Answer 14

less than 20 Hz

Question 15

Frequency of audible sound

Answer 15

between 20Hz and 20Khz

Question 16

Frequency of ultrasound

Answer 16

greater than 20 KHz

Question 17

What is the relationship between frequency and period

Answer 17

inversely related/reciprocal

Question 18

Period x Frequency=

Answer 18

1

Question 19

Which parameters are the “bigness” parameters

Answer 19

amplitude power intensity

Question 20

Difference between maximum value and average or undisturbed value of an acoustic variable

Answer 20

amplitude

Question 21

amplitude units

Answer 21

acoustic variables: pressure, density, distance

Question 22

Amplitude is determined by the

Answer 22

sound source

Question 23

Is amplitude adjustable

Answer 23

yes

Question 24

Measured from middle value to the max value

Answer 24

amplitude

Question 25

Difference between max and min values of an acoustic variable

Answer 25

peak-to-peak amplitude

Question 26

Rate of energy transfer or which work is performed

Answer 26

power

Question 27

Units of power

Answer 27

watts

Question 28

Initial power is determined by

Answer 28

sound source

Question 29

Is power adjustable

Answer 29

yes

Question 30

Equation for relation between amplitude and power

Answer 30

power (proportional to) amplitude^2

Question 31

As power increases, amplitude

Answer 31

increases

Question 32

Concentration of energy in a sound beam

Answer 32

Intensity

Question 33

Intensity units

Answer 33

watts/cm^2 (power and area)

Question 34

Intensity is determined by

Answer 34

sound source

Question 35

Is intensity adjustable

Answer 35

yes

Question 36

Equation for intensity

Answer 36

Intensity=(power/area) w/cm^2

Question 37

Intensity is _____ to power

Answer 37

directly proportional

Question 38

Intensity is ____ to amplitude ______

Answer 38

directly, squared

Question 39

Distance or length of one complete cycle

Answer 39

wavelength

Question 40

wavelength units of

Answer 40

length

Question 41

In clinical imaging, wavelength is soft tissue ranges from

Answer 41

0.1 to 0.8 mm

Question 42

Wavelength is determined by

Answer 42

sound source and medium

Question 43

Is wavelength adjustable

Answer 43

no

Question 44

Wavelength refers to _____ as period refers to ____

Answer 44

length, time

Question 45

Wavelength and frequency are _____ related

Answer 45

inversely

Question 46

Wavelength equation

Answer 46

wavelength (mm)=(1.54mm/microsec) / Frequency MHz

Question 47

Rate at which a sound wave travels through a medium

Answer 47

propagation speed

Question 48

Speed is units of

Answer 48

any distance divided by time (m/sec)

Question 49

Speed is determined by

Answer 49

medium

Question 50

Is speed adjustable

Answer 50

no

Question 51

What is the speed of sound in soft tissue

Answer 51

1540 m/sec

Question 52

Sound travels ______ in solids, ____ in liquids and ____ in gases.

Answer 52

fastest, slower, slowest

Question 53

What 2 characteristics of a medium affect the speed of sound

Answer 53

stiffness and density

Question 54

Describes the ability of an object to resist compression

Answer 54

stiffness

Question 55

Describes the relative weight of a material

Answer 55

Density

Question 56

How does stiffness affect speed

Answer 56

directly related

Question 57

How does density affect speed

Answer 57

inversely related