# Physics-Describing Sound Waves

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 Author: aprilh4485 ID: 111839 Filename: Physics-Describing Sound Waves Updated: 2011-11-04 20:47:01 Tags: sonography Folders: Description: Describing Sound Waves Show Answers:

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1. What is the period of the earth's rotation around the sun?
one year
2. A top is spinning on a table. What is the period of the spinning top?
A. 4 pounds
B. 0.05 seconds
C. 3 cm
D. 8 dollars
B.
(this multiple choice question has been scrambled)
3. Which of the following waves is infrasonic?
A. 4 MHz
B. 400 kHz
C. 28 Hz
D. 2 Hz
• D.
• its less than 20 Hz
4. Identify the wave that is ultrasounic.
A. 400 mHz
B. 4 MHz
C. 28 Hz
D. 2 Hz
• B.
• it is greater than 20 kHz
5. Which of these waves is ultrasounic and most useful in diagnostic sonography?
A. 400 MHz
B. 4 MHz
C. 2 kHz
D. 200,000 Hz
B.
(this multiple choice question has been scrambled)
6. Identify all the waves that are inaudible. (More than 1 may be correct)
A. 4 MHz
B. 400 kHz
C. 28 Hz
D. 2 Hz
• A, B, D
• A&B are ultrasonic
• D is infrasonic
7. Which of the following waves has the longest period?
A. 2 MHz
B. 4,000 Hz
C. 6 Hz
D. 1 kHz
• C.
• wave with the lowest frequency has the longest period
8. of the four waves whose periods are listed below, which has the highest frequency?
A. 8 s
B. 80 μs
C. 8 Ms
D. 800 ks
• B.
• wave with the shortest period has the highest frequency
9. Of the four wave whose frequencies are listed below, which has the shortest period?
A. 12 kHz
B. 6,000 Hz
C. 205 Hz
D. 1 kHz
• A.
• highest frequency will have the shortest wavelength
10. Of the four waves whose periods are listed below, which has the lowest frequency?
A. 8 s
B. 80 μs
C. 8 Ms
D. 800 ks
• C
• longest period will have the lowest frequency
11. What are the units of wavelength?
millimeters
12. What are the units of frequency?
hertz
13. What are the units of intensity?
watts/cm2
14. What are the units of propagation speed?
meters/second
15. What are the units of period?
second
16. What are the units of power?
watts
17. Does the medium or sound source determine wavelength?
both
18. Does the medium or sound source determine frequency?
sound source
19. Does the medium or the sound source determine the intensity (initial)?
sound source
20. Does the medium or the sound source determine the propagation speed?
medium
21. Does the medium or the sound source determine the period?
sound source
22. Does the medium or the sound source determine the power?
sound source
23. Does the medium or the sound source determine the amplitude?
sound source
24. Which of the following can be changed by the sonographer? wavelength, frequency, intensity, propagation speed, period, power, amplitude (initial)
intensity, power and amplitude
25. True or False.
A wave with a frequency of 15,000 MHz is ultrasonic.
True. It is greater than 20,000 Hz
26. True or false.
If the amplitude of a wave is increased to 3 times its original value, the intensity is increased by 6 times.
False. Intensity is proportional to the amplitude squared, if amplitude is tripled, we increase the intensity by a factor of 9

27. What best describes the line identified by the letter A?
A. amplitude
B. frequency
C. period
D. wavelength
E. peak-to-peak amplitude
E. peak-to-peak amplitude
(this multiple choice question has been scrambled)

28. What best describes the line identified by letter B?
A. amplitude
B. peak-to-peak amplitude
C. frequency
D. wavelength
E. none of the above
E. none of the above

29. What best describes the line identified by the letter C?
A. frequency
B. wavelength
C. amplitude
D. peak-to-peak amplitude
E. none of the above
C. amplitude
(this multiple choice question has been scrambled)

30. Which of the lines above, A, B, C or D, is most likely to be the reciprocal of frequency?
D.

31. What best describes the line identified by the letter D?
A. wavelength
B. amplitude
C. peak-to-peak amplitude
D. frequency
E. none of the above
A. wavelength
(this multiple choice question has been scrambled)

32. What best describes the line identified by the letter D?
A. frequency
B. period
C. amplitude
D. peak-to-peak amplitude
E. none of the above
B. period
(this multiple choice question has been scrambled)

33. Which of the lines above, A, B or C, is the most likely to be determined by the source and the medium?
B.
34. True or False.
If the power of a wave is halved, the intensity is reduced to one-forth its original value
false, half the power = half the intensity
35. True or False.
Propagation speed increases as frequency increases.
false, frequency is unrelated to speed
36. Medium 1 has density of 9 and stiffnesss of 6.
Medium 2 has density of 8 and stiffness of 6.
In which medium will sound travel faster?
Medium 1, since both have same stiffness, the one with the greater density has the lower propagation speed
37. Which of the following characteristics will create the fastest speed of sound?
A. high density, high stiffness
B. low density, high stiffness
C. high density, low stiffness
D. low density, low stiffness
• B.
• Speed is inversely proportional to density and directly proportional to stiffness
38. Which of the following characteristics will create the slowest speed of sound?
A. high density, high stiffness
B. low density, high stiffness
C. high density, low stiffness
D. low density, low stiffness
• C.
• Speed is inversely proportional to density and directly proportional to stiffness
39. If the power in a beam is 1 watt and the area is 5 cm2, what is the beam's intensity?
A. 5 W/cm2
B. 1 W/cm2
C. 0.2 W/cm2
D. 1 watt
• C.
• Intensity = watts/area
40. If intensity remains the same while the power is doubled, what happened to the beam area?
doubled, if the intensity remains unchanged, then whatever happened to the power has to happen to the area.
41. A sound beam travels a total of 10 cm in 2 seconds. What is the speed of the sound?
5 cm/sec
42. True or False.
Propagation speed increases as frequency increases.
False
43. True or False.
Propagation speed increases as frequency decreases.
False
44. True or False.
Propagation speed does not change as frequency increase
• True.
• Propagation speed and frequency are unrelated.
45. What is the wavelength of 3 MHz sound in soft tissue?
• 0.51 mm
• 1.54 mm/3 MHz = 0.51 mm
46. What is the wavelength of a wave with an unknown frequency traveling in soft tissue?
A. 0.51 mm
B. 0.51 μs
C. 0.51 nm
D. 0.51 pascals
E. 0.51 m/s
A. its the only one with the correct units
(this multiple choice question has been scrambled)
47. The effects of sound waves on tissue in the body are called __________.
bioeffects
48. What are the acoustic variables?
density, particle motion, temperature, pressure
49. What are the acoustic parameters?
frequency, period, wavelength, propagation speed, amplitude, power, intensity
50. The effects of tissue on sound waves are called __________.
acoustic propagation properties
51. Th effects of a medium on an ultrasound wave are called __________.
acoustic propagation properties
52. How are frequency and period related?
inversely
53. How are amplitude and power related?
directly
54. How are amplitude and intensity related?
directly
55. How are power and intensity related?
directly
56. How are wavelength and intensity related?
unrelated
57. How are wavelength and frequency related?
inversely
58. How are acoustic velocity and density related?
inversely
59. How are elasticity and speed of sound related?
inversely
60. How are acoustic velocity and compressibility related?
inversely
61. How are stiffness and speed of sound related?
directly
62. How are frequency and sound speed related?
unrelated
63. How are frequency and intensity related?
unrelated
64. How are power and frequency related?
unrelated

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