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Sound waves: Distance between two seats at which the tone of a horn cannot be heard

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A row of seats is parallel to a stage at a distance of 8.7 m from it. At the center and front of the stage is a diffraction horn loudspeaker. This speaker sends out its sound through an opening that is like a small doorway with a width D of 7.5 cm. The speaker is playing a tone that has a frequency of 1.0 × 104 Hz. The speed of sound is 343 m/s. What is the distance between two seats, located near the center of the row, at which the tone cannot be heard?

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The expert determines that distance between two seats which the tone of a horn cannot be heard using sound waves.

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A row of seats is parallel to a stage at a distance of 8.7 m from it. At the centre and front of the ...

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