Physics Test #1 Chapter 2 Part 1

29 Questions  I  By KFeyler
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  • 1. 
    A wave is a traveling variation in quantities called?

  • 2. 
    Sound is a traveling variation in quantities called?

  • 3. 
    Ultrasound is a sound with a frequency greater than ________Hz

  • 4. 
    Acoustic Variables include __________, __________, and __________ _________*3 Variables*
    • A. 

      Wave

    • B. 

      Pressure

    • C. 

      Density

    • D. 

      Particle Vibration


  • 5. 
    Which of the following frequencies are in the Ultrasound Range?
    • A. 

      15 Hz

    • B. 

      15,000 Hz

    • C. 

      15 MHz

    • D. 

      30,000Hz

    • E. 

      0.04 MHz


  • 6. 
    Which of the following are Acoustic Variables? ***More than one correct answer***
    • A. 

      Pressure

    • B. 

      Frequecy

    • C. 

      Propagation Speed

    • D. 

      Particle Motion

    • E. 

      Period


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

  • 8. 
    The unit of frequency is ______, which is abbreviated________

  • 9. 
    Period is the ______ that it takes for one cycle to occur.

  • 10. 
    Period decreases as ____________ increases.

  • 11. 
    Wavelength is the length of ______ over which one cycle occurs

  • 12. 
    Propagation Speed is the speed with which a ________ moves through a medium in 1 second.

  • 13. 
    Wavelength is equal to _________ ________ divided by _________

  • 14. 
    The _________ and_________ of a medium determine Propagation Speed

  • 15. 
    Propagation Speed Increases if ____________ is Increased.

  • 16. 
    The average Propagation Speed in soft tissues is ?
    • A. 

      1,540 m/s

    • B. 

      1,540 mm/us

    • C. 

      1.54 m/s

    • D. 

      1.54 mm/us


  • 17. 
    Propagation Speed is determined by
    • A. 

      Frequency

    • B. 

      Amplitude

    • C. 

      Wavelength

    • D. 

      Period

    • E. 

      Medium


  • 18. 
    The wavelength of 7-MHz ultrasound in soft tissue is __________mm

  • 19. 
    Wavelength in Soft Tissue _________ as Frequency Increases

  • 20. 
    It takes ________us for ultrasound to travel 1.54cm  in Soft Tissue

  • 21. 
    Propagation Speed in Bone is ______ than in Soft Tissue.

  • 22. 
    Sound travels fastest in?
    • A. 

      Air

    • B. 

      Helium

    • C. 

      Water

    • D. 

      Steel

    • E. 

      A Vacuum


  • 23. 
    Solids have higher propagation speeds than liquids because they have greater
    • A. 

      Density

    • B. 

      Stiffness


  • 24. 
    Sounds travels slowest in?
    • A. 

      Gases

    • B. 

      Steel


  • 25. 
    Sound is a _____________wave *More than 1 correct answer*
    • A. 

      Mechanical

    • B. 

      Longitudinal

    • C. 

      Compressional


  • 26. 
    If Frequency in Soft Tissue is Doubled, Propagation Speed is _________....

  • 27. 
    If Wavelength is 2mm and the frequency is Doubled the Wavelength becomes__________mm

  • 28. 
    From given values for propagation speed and frequency, which of the following can be calculated?
    • A. 

      Amplitude

    • B. 

      Impedance

    • C. 

      Wavelength

    • D. 

      Amplitude and Impedance

    • E. 

      Impedance and Wavelength


  • 29. 
    If two media have different stiffness, the one with the higher stiffness will have the higher propagation speed.
    • A. 

      True

    • B. 

      False


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