Doppler Effect
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PHYSICS
Wave Phenomena
Doppler Effect
The Doppler effect reveals how motion changes the pitch and frequency of waves perceived by observers
31 Jan 2026
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How does the Doppler effect explain the change in pitch of a siren as an ambulance passes by an observer?
The sound waves are compressed as the ambulance approaches, increasing frequency and pitch, and stretched as it moves away, decreasing frequency and pitch.
The siren changes its pitch intentionally to alert people as it moves.
The pitch remains constant but the observer's ears perceive it differently due to sound reflection.
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