A car with the windows rolled down is traveling north on a road at a speed of 25.0 m/s. An ambulance, traveling south at a speed of 37.0 m/s, approaches with its siren producing sound at a frequency of 2500 Hz. (Enter your answers in Hz. Assume that the speed of sound in air is 343 m/s.)
(a)
What frequency does the driver of the car observe as the ambulance approaches? (Enter your answer to the nearest integer.)
Apply the Doppler equation. Note that in this case, the source and observer are approaching each other, so vO and vS are both positive. Hz
(b)
What frequency does the driver of the car detect after the ambulance passes her?
Apply the Doppler equation. Notice that the source and observer are moving away from each other. What does that tell you about the signs of vO and vS? Hz
(c)
Repeat parts (a) and (b) for the case when the ambulance is traveling northbound.
while ambulance overtakes Hzafter ambulance passes Hz