Hedrick: Technology for Diagnostic Sonography
Chapter 1: Properties of Sound Waves
Test Bank
MULTIPLE CHOICE
1. What is the wavelength in soft tissue for a 10-MHz ultrasonic wave?
a. 0.15 cm c. 0.30 cm
b. 0.15 mm d. 0.30 mm
ANS: B
Determined by the relationship between acoustic velocity, frequency, and wavelength
PTS: 1 REF: 6
OBJ: Know the relationship between acoustic velocity, frequency, and wavelength.
TOP: Properties of sound waves
2. What is the wavelength in fat for a 5-MHz ultrasonic wave?
a. 0.14 cm c. 0.29 cm
b. 0.14 mm d. 0.29 mm
ANS: D
Determined by the relationship between acoustic velocity, frequency, and wavelength
PTS: 1 REF: 6
OBJ: Know the relationship between acoustic velocity, frequency, and wavelength.
TOP: Properties of sound waves
3. What is the period for a 5-MHz ultrasonic wave?
a. 0.2 ns c. 0.2 ms
b. 0.2 s d. 0.2 s
ANS: B
Determined by the relationship between frequency and period
PTS: 1 REF: 4
OBJ: Know the relationship between frequency and period. TOP: Properties of sound
waves
4. What is the period for a 10-MHz ultrasonic wave?
a. 0.10 s c. 0.20 s
b. 0.15 s d. 0.30 s
ANS: A
Copyright © 2013 by Mosby, an imprint of Elsevier Inc.
, Test Bank 1-2
Determined by the relationship between frequency and period
PTS: 1 REF: 4
OBJ: Know the relationship between frequency and period. TOP: Properties of sound
waves
5. What term describes the region of increased molecular density induced by sound
propagation in a medium?
a. Compression c. Fresnel
b. Focal d. Rarefaction
ANS: A
Pressure variations produce alternating regions of high and low particle density.
PTS: 1 REF: 1-2 OBJ: Describe the propagation of sound.
TOP: Properties of sound waves
6. What is the compression zone?
a. Region of high particle density c. Region of high acoustic impedance
b. Region of low particle density d. Region of low acoustic impedance
ANS: A
Pressure variations produce alternating regions of high and low particle density.
PTS: 1 REF: 1-2 OBJ: Describe the propagation of sound.
TOP: Properties of sound waves
7. What term describes the region of decreased molecular density induced by sound
propagation in a medium?
a. Compression c. Fresnel
b. Focal d. Rarefaction
ANS: D
Pressure variations produce alternating regions of high and low particle density.
PTS: 1 REF: 1-2 OBJ: Describe the propagation of sound.
TOP: Properties of sound waves
8. What is the rarefaction zone?
a. Region of high particle density c. Region of high acoustic impedance
b. Region of low particle density d. Region of low acoustic impedance
ANS: B
Pressure variations produce alternating regions of high and low particle density.
PTS: 1 REF: 1-2 OBJ: Describe the propagation of sound.
Copyright © 2013 by Mosby, an imprint of Elsevier Inc.
, Test Bank 1-3
TOP: Properties of sound waves
9. What term describes the number of pressure oscillations per unit of time?
a. Acoustic velocity c. Period
b. Frequency d. Wavelength
ANS: B
Definition of frequency
PTS: 1 REF: 4 OBJ: Know the definition of frequency.
TOP: Properties of sound waves
10. What term describes the distance between compression zones?
a. Acoustic velocity c. Period
b. Frequency d. Wavelength
ANS: D
Definition of wavelength.
PTS: 1 REF: 3 OBJ: Know the definition of wavelength.
TOP: Properties of sound waves
11. What term describes the distance of one cycle for a wave?
a. Acoustic velocity c. Period
b. Frequency d. Wavelength
ANS: D
Definition of wavelength.
PTS: 1 REF: 3 OBJ: Know the definition of wavelength.
TOP: Properties of sound waves
12. What is the frequency for the ultrasound wave, which has a wavelength of 0.20 mm in
soft tissue?
a. 10 MHz c. 6 MHz
b. 7.5 MHz d. 3.5 MHz
ANS: B
Determined by the relationship between acoustic velocity, frequency, and wavelength
PTS: 1 REF: 6
OBJ: Know the relationship between acoustic velocity, frequency, and wavelength.
TOP: Properties of sound waves
13. Which material has the lowest acoustic velocity?
a. Bone c. Muscle
Copyright © 2013 by Mosby, an imprint of Elsevier Inc.
, Test Bank 1-4
b. Fat d. Air
ANS: D
Determined by the bulk modulus and density of the medium
PTS: 1 REF: 6 OBJ: Know the relative velocity for various
materials.
TOP: Properties of sound waves
14. In which material does a 10-MHz sound wave have the longest wavelength?
a. Bone c. Muscle
b. Fat d. Air
ANS: A
Material with the greatest acoustic velocity has the longest wavelength.
PTS: 1 REF: 6
OBJ: Know the relationship between acoustic velocity, frequency, and wavelength.
TOP: Properties of sound waves
15. What is the period of an ultrasound wave whose frequency is 5 MHz?
a. 0.002 s c. 3.1 x 10-4 s
6
b. 5 x 10 s d. 2.0 x 10-7 s
ANS: D
Determined by the relationship between frequency and period
PTS: 1 REF: 4
OBJ: Know the relationship between frequency and period. TOP: Properties of sound
waves
16. Which factor affects the acoustic velocity in a medium?
a. Density of the medium
b. Cross-sectional area of ultrasound beam
c. Wavelength
d. Frequency
ANS: A
Acoustic velocity is determined by the bulk modulus and density of the medium.
PTS: 1 REF: 5 OBJ: Identify the factors that affect acoustic
velocity.
TOP: Properties of sound waves
17. What characterizes the elasticity of a medium?
a. Fractional change is shape from an applied force
Copyright © 2013 by Mosby, an imprint of Elsevier Inc.
Chapter 1: Properties of Sound Waves
Test Bank
MULTIPLE CHOICE
1. What is the wavelength in soft tissue for a 10-MHz ultrasonic wave?
a. 0.15 cm c. 0.30 cm
b. 0.15 mm d. 0.30 mm
ANS: B
Determined by the relationship between acoustic velocity, frequency, and wavelength
PTS: 1 REF: 6
OBJ: Know the relationship between acoustic velocity, frequency, and wavelength.
TOP: Properties of sound waves
2. What is the wavelength in fat for a 5-MHz ultrasonic wave?
a. 0.14 cm c. 0.29 cm
b. 0.14 mm d. 0.29 mm
ANS: D
Determined by the relationship between acoustic velocity, frequency, and wavelength
PTS: 1 REF: 6
OBJ: Know the relationship between acoustic velocity, frequency, and wavelength.
TOP: Properties of sound waves
3. What is the period for a 5-MHz ultrasonic wave?
a. 0.2 ns c. 0.2 ms
b. 0.2 s d. 0.2 s
ANS: B
Determined by the relationship between frequency and period
PTS: 1 REF: 4
OBJ: Know the relationship between frequency and period. TOP: Properties of sound
waves
4. What is the period for a 10-MHz ultrasonic wave?
a. 0.10 s c. 0.20 s
b. 0.15 s d. 0.30 s
ANS: A
Copyright © 2013 by Mosby, an imprint of Elsevier Inc.
, Test Bank 1-2
Determined by the relationship between frequency and period
PTS: 1 REF: 4
OBJ: Know the relationship between frequency and period. TOP: Properties of sound
waves
5. What term describes the region of increased molecular density induced by sound
propagation in a medium?
a. Compression c. Fresnel
b. Focal d. Rarefaction
ANS: A
Pressure variations produce alternating regions of high and low particle density.
PTS: 1 REF: 1-2 OBJ: Describe the propagation of sound.
TOP: Properties of sound waves
6. What is the compression zone?
a. Region of high particle density c. Region of high acoustic impedance
b. Region of low particle density d. Region of low acoustic impedance
ANS: A
Pressure variations produce alternating regions of high and low particle density.
PTS: 1 REF: 1-2 OBJ: Describe the propagation of sound.
TOP: Properties of sound waves
7. What term describes the region of decreased molecular density induced by sound
propagation in a medium?
a. Compression c. Fresnel
b. Focal d. Rarefaction
ANS: D
Pressure variations produce alternating regions of high and low particle density.
PTS: 1 REF: 1-2 OBJ: Describe the propagation of sound.
TOP: Properties of sound waves
8. What is the rarefaction zone?
a. Region of high particle density c. Region of high acoustic impedance
b. Region of low particle density d. Region of low acoustic impedance
ANS: B
Pressure variations produce alternating regions of high and low particle density.
PTS: 1 REF: 1-2 OBJ: Describe the propagation of sound.
Copyright © 2013 by Mosby, an imprint of Elsevier Inc.
, Test Bank 1-3
TOP: Properties of sound waves
9. What term describes the number of pressure oscillations per unit of time?
a. Acoustic velocity c. Period
b. Frequency d. Wavelength
ANS: B
Definition of frequency
PTS: 1 REF: 4 OBJ: Know the definition of frequency.
TOP: Properties of sound waves
10. What term describes the distance between compression zones?
a. Acoustic velocity c. Period
b. Frequency d. Wavelength
ANS: D
Definition of wavelength.
PTS: 1 REF: 3 OBJ: Know the definition of wavelength.
TOP: Properties of sound waves
11. What term describes the distance of one cycle for a wave?
a. Acoustic velocity c. Period
b. Frequency d. Wavelength
ANS: D
Definition of wavelength.
PTS: 1 REF: 3 OBJ: Know the definition of wavelength.
TOP: Properties of sound waves
12. What is the frequency for the ultrasound wave, which has a wavelength of 0.20 mm in
soft tissue?
a. 10 MHz c. 6 MHz
b. 7.5 MHz d. 3.5 MHz
ANS: B
Determined by the relationship between acoustic velocity, frequency, and wavelength
PTS: 1 REF: 6
OBJ: Know the relationship between acoustic velocity, frequency, and wavelength.
TOP: Properties of sound waves
13. Which material has the lowest acoustic velocity?
a. Bone c. Muscle
Copyright © 2013 by Mosby, an imprint of Elsevier Inc.
, Test Bank 1-4
b. Fat d. Air
ANS: D
Determined by the bulk modulus and density of the medium
PTS: 1 REF: 6 OBJ: Know the relative velocity for various
materials.
TOP: Properties of sound waves
14. In which material does a 10-MHz sound wave have the longest wavelength?
a. Bone c. Muscle
b. Fat d. Air
ANS: A
Material with the greatest acoustic velocity has the longest wavelength.
PTS: 1 REF: 6
OBJ: Know the relationship between acoustic velocity, frequency, and wavelength.
TOP: Properties of sound waves
15. What is the period of an ultrasound wave whose frequency is 5 MHz?
a. 0.002 s c. 3.1 x 10-4 s
6
b. 5 x 10 s d. 2.0 x 10-7 s
ANS: D
Determined by the relationship between frequency and period
PTS: 1 REF: 4
OBJ: Know the relationship between frequency and period. TOP: Properties of sound
waves
16. Which factor affects the acoustic velocity in a medium?
a. Density of the medium
b. Cross-sectional area of ultrasound beam
c. Wavelength
d. Frequency
ANS: A
Acoustic velocity is determined by the bulk modulus and density of the medium.
PTS: 1 REF: 5 OBJ: Identify the factors that affect acoustic
velocity.
TOP: Properties of sound waves
17. What characterizes the elasticity of a medium?
a. Fractional change is shape from an applied force
Copyright © 2013 by Mosby, an imprint of Elsevier Inc.
