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Two in-phase loudspeakers are placed along a wall and are separated by a distance of 4.00 m. They emit sound with a fre...

Two in-phase loudspeakers are placed along a wall and are separated by a distance of 4.00 m. They emit sound with a frequency of 514 Hz. A person is standing away from the wall, in front of one of the loudspeakers. What is the closest distance from the wall the person can stand and hear constructive interference? The speed of sound in air is 343 m/s.
Multiple choice:
1.64 m
1.15 m
0.344 m
0.729 m
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