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A police car sounding a siren with a frequency of 1640 Hz is traveling at 115...

A police car sounding a siren with a frequency of 1640 Hz is traveling at 115 km/h .

What frequencies does an observer standing next to the road hear as the car approaches and as it recedes?

What frequencies are heard in a car traveling at 90.0 km/hkm/h in the opposite direction before and after passing the police car?

The police car passes a car traveling in the same direction at 80.0 km/hkm/h. What two frequencies are heard in this car?

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