(Solution) - Two loudspeakers are separated by a distance of 6 m -(2025 Original AI-Free Solution)

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Two loudspeakers are separated by a distance of 6 m. A listener sits directly in front of one speaker at a distance of 8 m so that the two speakers and the listener form a right triangle.
(a) Find the two lowest frequencies for which the path difference from the speakers to the listener is an odd number of half-wavelengths.
(b) Why can these frequencies be heard even if the speakers are driven in phase by the same amplifier?