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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 15m/s,

a beat frequency of 5.5 Hz is heard. What is the frequency the horns emit? Assume T = 200C.

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Added Thu, 10 Dec '15
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source moving toward the observer at rest requires the formula: f' = f / (1 - Vsource / Vsnd)

5.5 = f / (1 - 15/ 343)

(1 - 15 / 343) * (5.5) = f

f = 5.26

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Added Thu, 10 Dec '15
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