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What is the frequency of the tuning fork?

  1. Feb 17, 2009 #1
    1. The problem statement, all variables and given/known data

    A 40 cm long tube has 40 cm long insert that can be pulled in and out. A vibrating tuning fork is held next to the tube. as the insert is slowly pulled out the sound from the tuning fork creates standing waves in the tube when the total length is 42.5 cm, 56.7 cm, and 70.9 cm. what is the frequency of the tuning fork? The air temperature is 20 degree C.

    2. Relevant equations

    f = mv/2L

    figure is attached

    3. The attempt at a solution

    f = 14.2
    v = 343 m/s
    L =(40+40) cm = 80 cm = 0.8 m

    f = mv/2L = (1*343 m/s)/2*0.8 m = 214. 375 hz

    got it wrong. not sure how to do it
     

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  3. Feb 17, 2009 #2

    rl.bhat

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    Homework Helper

    total length is 42.5 cm, 56.7 cm, and 70.9 cm.
    These values indicate that the open tube resonates at every increase of equal length of the tube. At open tube this length must be half the wave length.
     
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