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Sonar waves

  1. Jan 30, 2014 #1
    1. The problem statement, all variables and given/known data
    A sonar echo returns to a submarine 1.10s after being emitted. What is the distance to the object creating the echo?


    2. Relevant equations

    rate X time = distance

    3. The attempt at a solution( 1533m/s X 1.01s) divided by 2 = distance
     
  2. jcsd
  3. Jan 30, 2014 #2

    jedishrfu

    Staff: Mentor

    It looks like you're on the right track. What answer did you get?

    So what is your question?
     
  4. Jan 30, 2014 #3
    The answer I came up with 744.165m
     
  5. Jan 30, 2014 #4

    BvU

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    I take it the 1533 m/s is the speed of sound under water ? If so, you should mention it under 'given/known' data. That prevents we have to guess after what you were given to do the exercise.

    As a physicist, I would say that the 1.10 s has three significant digits at most. So the answer shouldn't have more than 3 digits, (max 4 if the first is a 1).
     
  6. Jan 30, 2014 #5

    jedishrfu

    Staff: Mentor

    To be even more accurate in the real world, you'd need to specify the depth, the temperate and salinity too but that's beyond the scope of this problem.

    http://en.wikipedia.org/wiki/Underwater_acoustics
     
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