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The doplar effect is like when you are standing on the sidewalk and you hear a car coming, see it pass and then hear it leaving. As it approaches, the sound builds gradually and increases in pitch, and after it passes you, it drops quickly in pitch. This is because as the car is approaching you, each sound wave has a shorter distance to travel to your ear than the first one, and as a result they "smush" each other together, shortening the wavelength and increasing the pitch.

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Q: What is a Doplar Effect?
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