Two In-Phase Loudspeakers That Emit Sound with the Same Frequency

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 hears no sound (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

Correct Answer:

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