Two speakers are producing sinusoidal sound coherently in phase. The speakers
are separated by a distance of n1, and the wavelength of the sound
is n2. See the figure below. At the point A, the waves are
in phase and the intensity is IA. The point B is located
"in line" with the two speakers, and the same distance away from the center
of the speakers as point A. What is the sound intensity at the point
B? If the sound intensity at the point B is
IB = IA/n3,
what is n3? Note that n1 and n2 have the same units
of length, and n3 is unitless.
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