variations on frequency

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From: Deb Jensen (deb@meer.net)
Date: Sun May 18 2003 - 11:41:58 PDT 

Message-Id: <l03110732baed840f92e8@[172.20.8.253]>
Date: Sun, 18 May 2003 11:41:58 -0700
From: Deb Jensen <deb@meer.net>
Subject: variations on frequency

>The 1/4 length is where the air column resonates. I presume that iff you had
>a longer piece of pvc, you would find resonance again at 1/2 the wave
>length.

With a CLOSED pipe (ie, water at one end, as in this demo), you get
resonance with a displacement antinode at the open end and a node at the
closed end. So, as you say, the first resonance is at 1/4 wavelength. But
the next is at 3/4, then 5/4, etc. - increasing by 1/2 wavelength
increments starting at 1/4 wavelength.

deb \m/

"War is God's way of teaching Americans geography" - Ambrose Bierce

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