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Thread: Open pipes

  1. #1 Open pipes 
    Forum Masters Degree thyristor's Avatar
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    Hi!
    Right now, we're studying waves in physics, and when I read the textbook I discovered something, in my opinion hard to understand, which was not explained in the textbook.
    What I wonder is how standing waves are created in open tubes? It seems to me the waves cannot "bounce" at the end of the pipe, like they do in closed pipes.


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  3. #2 Re: Open pipes 
    Geo
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    Quote Originally Posted by thyristor
    Hi!
    Right now, we're studying waves in physics, and when I read the textbook I discovered something, in my opinion hard to understand, which was not explained in the textbook.
    What I wonder is how standing waves are created in open tubes? It seems to me the waves cannot "bounce" at the end of the pipe, like they do in closed pipes.
    The closed end of a pipe always has a node.

    The open end of a pipe always has an antinode.


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  4. #3  
    Forum Masters Degree thyristor's Avatar
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    Could you please elaborate? What I don't understand is how the length of the pipe can affect the frequency of the tone when the pipe is open.
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  5. #4  
    Geo
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    Quote Originally Posted by thyristor
    Could you please elaborate? What I don't understand is how the length of the pipe can affect the frequency of the tone when the pipe is open.
    There has to be an antinode at each end of an open pipe. By changing the length of the pipe the wavelength increases and frequency decreases.

    It's only the column of air in the pipe that's forming a standing wave.
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  6. #5  
    Forum Masters Degree thyristor's Avatar
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    Quote Originally Posted by Geo
    Quote Originally Posted by thyristor
    Could you please elaborate? What I don't understand is how the length of the pipe can affect the frequency of the tone when the pipe is open.
    There has to be an antinode at each end of an open pipe. By changing the length of the pipe the wavelength increases and frequency decreases.

    It's only the column of air in the pipe that's forming a standing wave.
    But why has there to be an antinode?
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