1) There are six nodes (N = 6) in the air column. The number of quarter wavelengths in the length of the pipe is "J=2N-1=2(6)-1=11".
"\\lambda=\\frac{4l}{11}"
"\\lambda=\\frac{4}{11}225.5=82\\ cm"
2)
3) The next resonance will occur when the open vertical tube has a length of one half wavelength greater than its initial wave length.
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