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Homework Help: Sound/Wave Physics Question

  1. Oct 16, 2008 #1
    1. The problem statement, all variables and given/known data
    A closed tube filled with air is 50cm long.
    a. what is the length of an open tube that has the same fundamental frequency? 100cm (34,500cm/s^2 / 2(100cm)
    b. what is the frequency? 172.5 (34,500cm/s^2 / 4 (50cm)

    I got these two but, need help on this:
    c. These two tubes are placed in a gas with a speed of sound grteater than the sound in air. Do the frequencies of their fundamentals remain equal to each other?
    d. Do they increase or decrease?

    2. Relevant equations

    v/2L (fundamental frequency of the first harmonic, open tube)
    v/4L (fundamental frequency of the first harmonic, closed tube)

    L = length of tube

    3. The attempt at a solution

    By CLOSED tube in all these problems - it means closed on ONE SIDE only.
  2. jcsd
  3. Oct 16, 2008 #2


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    Homework Helper

    So, tell us. What is 'v' in the equations you have written?
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