### What minimum vertical distance upward must the top speaker

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Q. Two loudspeakers are placed above and below each other and driven by the same source at a frequency of 4.50x10^2 Hz. An observer is in front of the speakers (to the right) at point O, at the same distance from each speaker. If the speed of sound is 345 m/s, what minimum vertical distance upward must the top speaker is moved to create destructive interference at point O?

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