Problem C12:
Two speakers, separated by a distance n_{1}, are producing sinusoidal
sound coherently in phase. At the point A in the figure, the sound waves are in phase
and experience constructive interference. If one walks from point A to point
B in the figure, the sound gradually diminishes in loudness until, at the
pointt B, the sound waves experience destructive interference. Point B is
a distance n_{2} directly in front of one of the speakers.
If the wavelength of the sound is n_{3},
what is n_{3}? Note that n_{1}, n_{2} and n_{3}
have the same units of distance.

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