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.
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