Where fobs is the frequency perceived by the observer, f is the frequency of the source, vw is the velocity of the wave, and vs is the velocity of the source.
Suppose an oncoming ambulance moving at 115 km/h emits a steady 785-Hz sound from its siren
What frequency, in Hz, does she observe after the ambulance has passed? The speed of sound on this day is 345 m/s
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