![]() 9.7: The Doppler Effect The Doppler effect is a physical phenomenon that most people have experienced many times: when a moving source of sound (say an ambulance, or more exactly its siren) is approaching you, its pitch sounds noticeably higher then after it passed you by and is moving away.Longitudinal waves, on the other hand, are somewhat harder to draw, but easily heard - as sound is the prime example of a longitudinal wave. 9.6: Sound Waves So far, we mostly considered transversal waves, which include waves in strings and waves on the surface of a pond, and are easily visualized. ![]() An important, and often encountered one is where the wave itself is used as the medium, by changing the amplitude over time.
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