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Test tomorrow...please help!
A student in a parked car honks the horn, which has a `proper' frequency of 310.00 Hz. An observer in an approaching vehicle measures the frequency of the sound to be 342 Hz. Calculate the speed of the approaching vehicle. Use 340 m/s as the speed of sound in air.
Fs = 310 Hz
Fo = 342 Hz
Vo = 0 m/s
V = 340 m/s
Vs = ?
I know
Vs = (Fs - Fo / Fs + Fo) * V
if the object is going away from the observer
but how I do calculate if the object is approaching the person?
Homework Statement
A student in a parked car honks the horn, which has a `proper' frequency of 310.00 Hz. An observer in an approaching vehicle measures the frequency of the sound to be 342 Hz. Calculate the speed of the approaching vehicle. Use 340 m/s as the speed of sound in air.
Homework Equations
The Attempt at a Solution
Fs = 310 Hz
Fo = 342 Hz
Vo = 0 m/s
V = 340 m/s
Vs = ?
I know
Vs = (Fs - Fo / Fs + Fo) * V
if the object is going away from the observer
but how I do calculate if the object is approaching the person?