Problem C19:
You have two pipes that are open at each end (i.e. open-open pipes).
One pipe has a fundamental frequency of n_{1} Hz. The
other pipe has a fundamental frequency of n_{2} Hz.
You now place the two pipes end-to-end to make one long pipe,
whose length equals the sum of the lengths of the two pipes.
What is the fundamental frequency of this long pipe? If
the fundamental frequency equals n_{3} Hz,
what is n_{3}? Note that n_{1}, n_{2} and
n_{3} have the same units of frequency.

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