While testing speakers for a concert tomaacutes sets up two, Ask an Expert

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While testing speakers for a concert, Tomás sets up two speakers to produce sound waves at the same frequency, which is between 100 Hz and 150 Hz. The two speakers vibrate in phase with one another. He notices that when he listens at certain locations, the sound is very soft (a minimum intensity compared to nearby points). One such point is 49.7 m from one speaker and 38.4 m from the other. What are the possible frequencies of the sound waves coming from the speakers? (The speed of sound in air is 343 m/s.) (Enter your answers from smallest to largest.) Hz

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