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I am building a drum out of pvc tubes (both ends open) and would like to confirm that my measurements are correct. If I want

I am building a drum out of pvc tubes (both ends open) and would like to confirm that my measurements are correct.

If I want to build an A note (4th octave) with a frequency of 440 Hz should the length of the pipe be 39.1 cm? I used speed of sound of 34 432.2 cm/s. Also if I want to build a C note (4th octave) with a frequency of 261.63 Hz should the length be 65.8cm?

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