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Sound source A is located at x = 0, y = 0, and sound source B...

Sound source A is located at x = 0, y = 0, and sound source B is located at x = 0, y = 2.0 m. The two sources radiate coherently and in phase. An observer at x = 15.8 m, y = 0 notes that as he takes a few steps from y = 0 in either the +yor −y-direction, the sound intensity diminishes. What is the lowest frequency, and the next to the lowest frequency of the sources that can account for that observation? (Enter your answers from smallest to largest.)

kHz

kHz

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