Two speakers, separated by a distance n1, 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 n2 directly in front of one of the speakers.
If the wavelength of the sound is n3,
what is n3? Note that n1, n2 and n3
have the same units of distance.
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