What does the Doppler Effect explain regarding sound waves when an ambulance with its siren moves away from you?
Answer
The sound waves are stretched out behind the ambulance, causing the pitch to sound lower.
The Doppler Effect demonstrates how wave motion affects perceived frequency. When a sound source, such as an ambulance siren, moves away from an observer, the sound waves emitted are stretched out as they travel behind the moving vehicle. This increase in wavelength results in a lower frequency, which the human ear perceives as a lower pitch. This principle of wave stretching is directly analogous to how light behaves when cosmic objects move away from an observer.
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