Resonant cavities have particular frequencies which resonate. Only small fraction of power of wave in pipe is reradiated/cycle. Length of pipe = tex2html_wrap78 wavelength.

For a pipe with a closed end, tex2html_wrap79 .

For a clarinet, tex2html_wrap80 so expect modes to be tex2html_wrap81 . It is actually 147Hz.

To get rid of the 1st mode, open a node tex2html_wrap82 of the way down the pipe. The first mode will radiate all of it's power away, but the second mode will be left intact.

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