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Sound wave physics problem

  1. Apr 15, 2009 #1
    1. A certain instant camera determines the distance to the subject by sending out a sound wave and measuring the time needed for the echo to return to the camera. How long would it take the sound wave to return to the camera if the subject were 3.00 m away?


    2. d = vt



    3. d = vt
    3 = 343t
    t = 8.75 x 10^-3 sec

    im not sure if this is correct.
     
  2. jcsd
  3. Apr 15, 2009 #2

    danago

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    Gold Member

    Re: Sound

    How far is the sound actually travelling in total? Is it really just 3m?
     
  4. Apr 15, 2009 #3
    Re: Sound

    yep its just 3m
     
  5. Apr 15, 2009 #4

    danago

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    Gold Member

    Re: Sound

    It travels 3m getting there, but what about the trip back to the camera? Its gotta travel another 3m, for a total of 6m.
     
  6. Apr 15, 2009 #5
    Re: Sound

    oh i see thank you! :]
     
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