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Homework Statement
A motor scooter moving at 10 m/s approaches and passes a police car moving at 50 m/s in the opposite direction. The frequency of the siren on the police car is 700 hz when the car stands still. the difference in frequency heard by the driver of the scooter between when the two vehicles are approaching each other and when the two vehicles are separating from each other is closest to..
Homework Equations
doppler effect equation
The Attempt at a Solution
I know I must find the frequency at one point and subtract it from the other to find the difference, but in the doppler equation I never know when the velocity of the source/listener must be subtracted/added to the speed of sound
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