Your car is third in line at a railroad crossing as a train moving at a constant
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Your car is third in line at a railroad crossing as a train moving at a constant speed approaches, with its whistle blowing constantly. To keep yourself from going crazy with the noise, you begin thinking about the relative difference between the frequency you hear and the frequency the engineer hears. Surely this must depend on the angle that your line of sight to the engine of the train makes with the perpendicular to the track.
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