Problem C14:
Two speakers are producing sinusoidal sound coherently in phase. The speakers
are separated by a distance of n_{1}. The wavelength of the sound
is n_{2}. See the figure below. A person starts out at point A
in the figure, which is far away from the speakers. The person walks in
a circle around the center of the speakers and returns to where he started. When he
does this, the sound gets loud n_{3} times during the circular
walk.
what is n_{3}? Note that n_{1} and n_{2} have the same units
of length, and n_{3} is unitless.

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