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Sound exits a diffraction horn loudspeaker through a rectangular opening like a small doorway. A person is sitting at an angle off to the side of a diffraction horn that has a width D of 0.0869 m. The speed of sound is 343m/s. This individual does not hear a sound wave that has afrequency of 10600 Hz. When she is sitting at an angle /2, there is a different frequency thatshe does not hear. What is it?

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