Calculate the speed of the car.

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You are in charge of calibrating the radar guns for a local police department. One such device emits microwaves at a frequency of 2.03 GHz. During the trials, these waves are reflected from a car moving directly away from the stationary emitter. You detect a frequency difference (between the received microwaves and the ones sent out) of 311 Hz. Calculate the speed of the car.

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