Two-Source Interference of Sound: Two in-phase loudspeakers that emit sound with the same frequency are placed along a wall and are separated by a distance of 8.00 m. A person is standing 12.0 m away from the wall, equidistant from the loudspeakers. When the person moves 3.00 m parallel to the wall, she experiences destructive interference for the second time. What is the frequency of the sound? The speed of sound in air is 343 m/s.
A. 278 Hz
B. 422 Hz
C. 452 Hz
D. 562 Hz
E. 694 Hz
Answer: A
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