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Doppler effect: Frequency the car horns emit when one is at rest and the other moving

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Two automobiles are equipped with the same single frequency horn. When one is at rest and the other is moving toward an observer at 15.9m/s, a beat frequency of 5.60Hz is heard. What is the frequency the horns emit? Assume T= 20 degrees celsuis

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In three steps with good explanations, the problem is solved.

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Step 1.
When two sounds which differ slightly in frequency are received simultaneously, an observer hears the 'beat note' which is their difference. Let f be the frequency received from the stationary horn, and f' the frequency received ...

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