Every time I pass an ambulance with blaring sirens, I think of the Doppler Effect. I learned about the Doppler Effect during my freshman year of high school, and it has stuck with me ever since. Basicaly, the Doppler Effect is the change in sound wave frequency of a moving object. When the moving object is coming closer, the sound waves are getting shorter which causes the frequency to increase and the sound to be more shrill (higher), but when the object passes, the sound waves become elongated again because there is nothing in the way of the sound waves. The result of the elongated waves is a deeper (lower) sound.
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