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Determining the speed of sound in air

  1. Dec 15, 2014 #1

    I have a problem with determining speed of sound basing on a data from laboratory.

    1. The problem statement, all variables and given/known data

    I have to determine speed of sound by measuring the shift of time in microphone compared to speaker. The distance between them is constant and I'm changing the frequency in generator, the results are:

    Frequency [kHz] Shift [us]
    6,42 0
    6,91 68
    7,41 22
    7,88 20
    8,4 68
    8,88 2
    9,425 42
    9,9 23

    The distance is S = 0,03 [m]
    2. Relevant equations
    I think that probably:

    t = a*f + b

    where t is time shift and f is frequency

    3. The attempt at a solution

    I tried to fit a line to the results, but I cannot interpret the output.

    Can someone help me? I would be very pleased.
  2. jcsd
  3. Dec 15, 2014 #2

    Simon Bridge

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    Science Advisor
    Homework Helper

    What does the experiment mean by "shift in time"?
    i.e. what is the physical process that gives rise to the time shift you observe?
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