The only thing that the tube told us was that by increasing the length by .5m, we found the previous harmonic produced by the fork. Since close tubes step by half-wavelengths, you can double the increase in L to get the wavelength (1.0 m)...yatta...yatta...yatta... 340 Hz.
Consider this post open to all last minute questions. Hope I (and the rest of us) can help out.
Hack.
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