Why does a tubes length affect wavelength of soundwave?

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In a wind instrument for example. Wouldn't a longer tube simply allow more compressions/rarefactions to be moving through the tube at any one time? Why does the wavelength change?
 

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Doc Al
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Astronuc
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In a wind instrument for example. Wouldn't a longer tube simply allow more compressions/rarefactions to be moving through the tube at any one time?
If one tube has length L, and another tube has length L+l,where l is the wavelength, then L+l has one more wave in the tube, but the speed of propagation (speed of sound) is a property of the gas in the tube, not the length of the tube.
 

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