Two loudspeakers are vibrating in phase. They are set up as in the figure, and point C is located as shown there. The speed of sound is 339 m/s. The speakers play the same tone. What is the smallest frequency that will produce destructive interference at point C?

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Two loudspeakers are vibrating in phase. They are set up as in the figure, and point C is located as shown there. The speed of sound is 339 m/s. The speakers play the same tone. What is the smallest frequency that will produce destructive interference at point C?

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