If the sound source is moving at sped v relative to the observer and if the speed of sound is V0, then the perceived frequency f is related to the actual frequency f0 as follows:
f = f0(v0/(v0(+/-)v))
We choose the minus sign if the source is moving toward the observer and the plus sign if it is moving away.
Suppose that a car drives at 100 ft/s past a woman standing on the shoulder of a highway, blowing it horn, which has a frequency of 500 Hz. Assume the speed of sound is 1130 ft./s.
Let A be the amplitude of the sound find the functions of the form
y = A sin wt
that model the perceived

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sound of as the car approaches the woman and as it recedes
THANK YOU

This was derived from f=f0(v0/v0+/-v)
Where f0=1130fps, V0=500Hz, and V=100fps

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