Physics Test #1 Chapter 2 Part 1

1. It takes ________us for ultrasound to travel 1.54cm in Soft Tissue

t = d / s
Speed of sound = 1.54 mm/us
Distance = 1.54cm **Convert to mm** 15mm

Explanation

t = d / s
Speed of sound = 1.54 mm/us
Distance = 1.54cm **Convert to mm** 15mm

Submit

2. Wavelength in Soft Tissue _________ as Frequency Increases

***If Frequency INCREASES ***Wave Length DECREASES
***If Frequency DECREASES *** Wave Length INCREASES

Explanation

***If Frequency INCREASES ***Wave Length DECREASES
***If Frequency DECREASES *** Wave Length INCREASES

Submit

3. Period is the ______ that it takes for one cycle to occur.

Time from the start of a cycle to the start of the next cycle *Period is determined by the Sound Source ONLY, not by the medium

Explanation

Time from the start of a cycle to the start of the next cycle *Period is determined by the Sound Source ONLY, not by the medium

Submit

7. Frequency is a measure of how many ______ an acoustic variable goes through in a second.

Frequency is reported in units of per second , 1/Sec, Hertz, or Hz. Hertz is another way to say "Per Second"

Explanation

Frequency is reported in units of per second , 1/Sec, Hertz, or Hz. Hertz is another way to say "Per Second"

Submit

8. The wavelength of 7-MHz ultrasound in soft tissue is __________mm

***Wavelength ( __ ) = Speed (1.54mm/us) / Frequency (7-Mhz)

* 1.54 mm/us DIVIDED by 7Mhz = 0.22mm

Explanation

***Wavelength ( __ ) = Speed (1.54mm/us) / Frequency (7-Mhz)

* 1.54 mm/us DIVIDED by 7Mhz = 0.22mm

Submit

9. If Wavelength is 2mm and the frequency is Doubled the Wavelength becomes__________mm

As long as a wave remains in one medium, wavelength and frequency are inversely related. As frequency increases, wavelength decreases. The lower the frequency, the longer the wavelength. **Example** If a wave's frequency is twice that of another, the wavelength will be HALF as much
*Edelman PG. 33*

Explanation

As long as a wave remains in one medium, wavelength and frequency are inversely related. As frequency increases, wavelength decreases. The lower the frequency, the longer the wavelength. **Example** If a wave's frequency is twice that of another, the wavelength will be HALF as much
*Edelman PG. 33*

Submit

11. If two media have different stiffness, the one with the higher stiffness will have the higher propagation speed.

True

False

Sound travels fastest in solids, slower in liquids, and slowest in gases

Explanation

Sound travels fastest in solids, slower in liquids, and slowest in gases

Submit

15. Wavelength is equal to _ divided by _

The relationship between the three is that wavelength is equal to Propagation speed (1,540 m/s or 1.54mm/us) divided by frequency. **This equation predicts that wavelength decreases as frequency increases **Page 19 & 20 in Kremkau**

Explanation

The relationship between the three is that wavelength is equal to Propagation speed (1,540 m/s or 1.54mm/us) divided by frequency. **This equation predicts that wavelength decreases as frequency increases **Page 19 & 20 in Kremkau**

Submit

16. If Frequency in Soft Tissue is Doubled, Propagation Speed is _________....

Propagation Speed is determined ONLY by the medium through which the sound is traveling.

Frequency of a sound wave is determined by the SOUND SOURCE only, not by the MEDIUM through which the sound is traveling

Explanation

Propagation Speed is determined ONLY by the medium through which the sound is traveling.

Frequency of a sound wave is determined by the SOUND SOURCE only, not by the MEDIUM through which the sound is traveling

Submit

18. Acoustic Variables include __, , and _
3 Variables

Wave

Pressure

Density

Particle Vibration

A Wave is a Traveling Variation

Explanation

A Wave is a Traveling Variation

Submit

19. Propagation Speed is determined by

Frequency

Amplitude

Wavelength

Period

Medium

Speed is determined only by the medium through which the sound is traveling **Propagation Speed is the speed of sound through a medium**

Explanation

Speed is determined only by the medium through which the sound is traveling **Propagation Speed is the speed of sound through a medium**

Submit

21. Sounds travels slowest in?

Gases

Steel

22. Solids have higher propagation speeds than liquids because they have greater

Density

Stiffness

23. Sound travels fastest in?

Air

Helium

Water

Steel

A Vacuum

Fastest in SOLIDS

Explanation

Fastest in SOLIDS

24. The _ and_ of a medium determine Propagation Speed

Stiffness (Hardness)is the resistance of a material to compression *Page 20 Kremkau*

Explanation

Stiffness (Hardness)is the resistance of a material to compression *Page 20 Kremkau*

Submit

25. From given values for propagation speed and frequency, which of the following can be calculated?

Amplitude

Impedance

Wavelength

Amplitude and Impedance

Impedance and Wavelength

26. Which of the following are Acoustic Variables?
More than one correct answer

Pressure

Frequecy

Propagation Speed

Particle Motion

Period

Submit

27. Sound is a _____________wave
More than 1 correct answer

Mechanical

Longitudinal

Compressional

Submit

28. The average Propagation Speed in soft tissues is ?

1,540 m/s

1,540 mm/us

1.54 m/s

1.54 mm/us

Submit

29. Which of the following frequencies are in the Ultrasound Range?

15 Hz

15,000 Hz

15 MHz

30,000Hz

0.04 MHz

Submit

Physics Test #1 Chapter 2 Part 1

1. It takes ________us for ultrasound to travel 1.54cm in Soft Tissue

2.

What first name or nickname would you like us to use?

2. Wavelength in Soft Tissue _________ as Frequency Increases

3. Period is the ______ that it takes for one cycle to occur.

4. Period decreases as ____________ increases.

5. Propagation Speed is the speed with which a ________ moves through a medium in 1 second.

6. Ultrasound is a sound with a frequency greater than ________Hz

7. Frequency is a measure of how many ______ an acoustic variable goes through in a second.

8. The wavelength of 7-MHz ultrasound in soft tissue is __________mm

9. If Wavelength is 2mm and the frequency is Doubled the Wavelength becomes__________mm

10. Sound is a traveling variation in quantities called?

11. If two media have different stiffness, the one with the higher stiffness will have the higher propagation speed.

12. Propagation Speed Increases if ____________ is Increased.

13. Wavelength is the length of ______ over which one cycle occurs

14. The unit of frequency is , which is abbreviated__

15. Wavelength is equal to _ divided by _

16. If Frequency in Soft Tissue is Doubled, Propagation Speed is _________....

17. Propagation Speed in Bone is ______ than in Soft Tissue.

18. Acoustic Variables include __, , and _
3 Variables

19. Propagation Speed is determined by

20. A wave is a traveling variation in quantities called?

21. Sounds travels slowest in?

22. Solids have higher propagation speeds than liquids because they have greater

23. Sound travels fastest in?

24. The _ and_ of a medium determine Propagation Speed

25. From given values for propagation speed and frequency, which of the following can be calculated?

26. Which of the following are Acoustic Variables?
More than one correct answer

27. Sound is a _____________wave
More than 1 correct answer

28. The average Propagation Speed in soft tissues is ?

29. Which of the following frequencies are in the Ultrasound Range?

Physics Test #1 Chapter 2 Part 1

1. It takes ________us for ultrasound to travel 1.54cm in Soft Tissue

2.

What first name or nickname would you like us to use?

2. Wavelength in Soft Tissue _________ as Frequency Increases

3. Period is the ______ that it takes for one cycle to occur.

4. Period decreases as ____________ increases.

5. Propagation Speed is the speed with which a ________ moves through a medium in 1 second.

6. Ultrasound is a sound with a frequency greater than ________Hz

7. Frequency is a measure of how many ______ an acoustic variable goes through in a second.

8. The wavelength of 7-MHz ultrasound in soft tissue is __________mm

9. If Wavelength is 2mm and the frequency is Doubled the Wavelength becomes__________mm

10. Sound is a traveling variation in quantities called?

11. If two media have different stiffness, the one with the higher stiffness will have the higher propagation speed.

12. Propagation Speed Increases if ____________ is Increased.

13. Wavelength is the length of ______ over which one cycle occurs

14. The unit of frequency is ______, which is abbreviated________

15. Wavelength is equal to _________ ________ divided by _________

16. If Frequency in Soft Tissue is Doubled, Propagation Speed is _________....

17. Propagation Speed in Bone is ______ than in Soft Tissue.

18. Acoustic Variables include __________, __________, and __________ _________*3 Variables*

19. Propagation Speed is determined by

20. A wave is a traveling variation in quantities called?

21. Sounds travels slowest in?

22. Solids have higher propagation speeds than liquids because they have greater

23. Sound travels fastest in?

24. The _________ and_________ of a medium determine Propagation Speed

25. From given values for propagation speed and frequency, which of the following can be calculated?

26. Which of the following are Acoustic Variables? ***More than one correct answer***

27. Sound is a _____________wave *More than 1 correct answer*

28. The average Propagation Speed in soft tissues is ?

29. Which of the following frequencies are in the Ultrasound Range?

14. The unit of frequency is , which is abbreviated__

15. Wavelength is equal to _ divided by _

18. Acoustic Variables include __, , and _
3 Variables

24. The _ and_ of a medium determine Propagation Speed

26. Which of the following are Acoustic Variables?
More than one correct answer

27. Sound is a _____________wave
More than 1 correct answer