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Posted by on Tuesday, July 20, 2010 at 1:30am.

Original Q: If you pour liquid into a tall, narrow glass, you may hear sound with a steadily rising pitch. What is the source of the sound? And why does the pitch rise as the glass fills?

Additional question from me: What does it mean by the source of the sound? like the tapping on the glass?

  • PHYSICS - , Tuesday, July 20, 2010 at 6:07am

    The pouring of liquid into the glass can excite weak "organ pipe" vibrations of the air column above the liquid. As the column of air gets shorter, the frequency that you hear gets higher.

    It has nothing to do with tapping the glass, but a similar thing can happen with the vibrations of the glass itself if you do; in that case the frequency gets lower as the glass is filled.

  • PHYSICS - , Tuesday, January 17, 2012 at 6:16pm

    Plunger Jihads for the win!

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