Physics ch. 1-4

Question 1

How are power and frequency related

Answer 1

Unrelated

Question 2

What are 2 components of pulse repetition period?

Answer 2

• Transmit time (on time)
• Receive time (off time)

Question 3

How are frequency and intensity related

Answer 3

Unrelated

Question 4

How are frequency and sound speed related

Answer 4

Unrelated

Question 5

How are stiffness and sound speed related

Answer 5

Directly

Question 6

How are acoustic velocity and compressibility related

Answer 6

Inversely

Question 7

How are elasticity and speed sound related

Answer 7

Inversely

Question 8

How are amplitude and power related

Answer 8

Directly

Question 9

How are frequency and period related

Answer 9

Inversely

Question 10

How are acoustic velocity and density related

Answer 10

Inversely

Question 11

How are wavelength and intensity related

Answer 11

Unrelated

Question 12

How are wavelength and frequency related

Answer 12

Inversely

Question 13

How are power and intensity related

Answer 13

Directly

Question 14

How are amplitude and intensity related

Answer 14

Directly

Question 15

Which of the following are considered acoustic parameters?

A) Frequency
B) Density
C) Distance
D) Pressure
E) Period

Answer 15

A) Frequency and B) Period

Question 16

If intensity remains the same while the power is double what has happened to the beam area?

Answer 16

Doubled

Question 17

Which of the following are considered acoustic variables?

A Frequency
B Density
C Particle motion
D Temperature
E Period
F Pressure

Answer 17

Density
Particle Motion
Pressure

Question 18

True or False: propagation speed increases as frequency increases?

Answer 18

False

Question 19

The effects of sound waves on tissue in the body is called what?

Answer 19

Bioeffects

Question 20

What are two components of pulse ultrasound?

Answer 20

*Transmit ( talking or on time)
* Receive ( listening or off time)

Question 21

If the power in a beam is 1 watt and the area is 5 cm^2, what is the beam’s intensity?

Answer 21

0.2w/cm^2

Question 22

True or false: if the Amplitude of a wave is increased to three times is the original value. The intensity is increased by 6 times.

Answer 22

False, intensity is increased by 9 times.

Question 23

True or false: a wave with a frequency of 15,000 MHZ is ultrasonic

Answer 23

True

Question 24

The effects of a medium on an ultrasound wave are called?

Answer 24

Acoustic propagation properties

Question 25

What is the unit of intensity?

Answer 25

Watts/cm^2

Question 26

What is the unit to frequency

Answer 26

Hz

Question 27

What is the unit of wavelength

Answer 27

mm

Question 28

What is the unit of period

Answer 28

Seconds

Question 29

What is the unit Propagation speed

Answer 29

meters/sec

Question 30

What is the unit to power

Answer 30

Watts

Question 31

What is the median and what is the source?

Answer 31

*Propagation speed (medium)
*Frequency (sound source)
* Intensity (sound source)
*Period ( sound source)
* Wavelength (both)

Question 32

Can and cannot be changed by Sonographer?

Answer 32

Power ( can)
Amplitude ( can)
Intensity (can)
Wavelength (can not)
Propagation speed ( can not)
Period (can not)

Question 33

When frequency doubles what happens to wavelength?

Answer 33

Wavelength decreases by 1/2