Physics-Describing Sound Waves

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Author:
aprilh4485
ID:
111839
Filename:
Physics-Describing Sound Waves
Updated:
2011-11-04 20:47:01
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sonography
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Describing Sound Waves
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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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