Question: Two speakers are driven by the same oscillator whose frequency is f. They are located a distance d from each other on a vertical pole.

Two speakers are driven by the same oscillator whose frequency is f. They are located a distance d from each other on a vertical pole. A man walks straight toward the lower speaker in a direction perpendicular to the pole, as shown in Figure P18.9.
(a) How many times will he hear a minimum in sound intensity?
(b) How far is he from the pole at these moments? Let v represent the speed of sound, and assume that the ground does not reflect sound.

Two speakers are driven by the same oscillator

Figure P18.9 Probles 9 and 10

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