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Two automobiles are equipped with the same singlefrequency horn. When one is at rest and the...

Two automobiles are equipped with the same singlefrequency horn. When one is at rest and the other is moving toward the first at 19 m/sm/s , the driver at rest hears a beat frequency of 4.0 HzHz . What is the frequency the horns emit? Assume T=20∘C

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