Many towns have tornado sirens, large elevated sirens used to warn locals of imminent tornados. In one small town, a siren is elevated 100. m off the ground. A car is being driven at 100. km/h directly away from this siren while it is emitting a 440.-Hz sound. What is the frequency of the sound heard by the driver as a function of the distance from the siren at which he starts? Plot this frequency as a function of the car's position up to 1000. m. Explain this plot in terms of the Doppler effect.
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