Answer: Two automobiles are equipped with the same
Chapter 12, Problem 12.58(choose chapter or problem)
(II) Two automobiles are equipped with the same single frequency horn. When one is at rest and the other is moving toward the first at 18 m/s, the driver at rest hears a beat frequency of 4.5 Hz. What is the frequency the horns emit? Assume \(T = 20^{\circ}C\).
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