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You are driving down the highway at 14.9 m/s when you approach an automobile accident on...

You are driving down the highway at 14.9 m/s when you approach an automobile accident on the side of the road. To keep traffic away from it, a stationary police car has its siren going; to the police, the siren has a frequency of 1100 Hz. If the speed of sound in air is 332 m/s, what frequency (in Hz) will be heard by you in your car?

If the relative motion in the previous question was reversed (i.e. if the question had source and observer moving apart, they would now be moving closer together, and vice versa), would the frequency heard by the observer be higher, lower, or the same as before?

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