Two automobiles are equipped with the same single-frequency, Physics

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Two automobiles are equipped with the same single-frequency

Two automobiles are equipped with the same single-frequency horn. When one is at rest and the other is moving toward the first at 13m/s , the driver at rest hears a beat frequency of 7.0Hz. What is the frequency the horns emit? Assume T = 20 degrees C. Express your answer using two significant figures.

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Physics: Two automobiles are equipped with the same single-frequency

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