How It Works
When a sound source moves toward you, sound waves bunch up, making higher pitch. Moving away stretches waves, lowering pitch. This is how radar guns measure car speeds and how astronomers measure star velocities.
Hear pitch change as a siren zooms past — sound as physics
When a sound source moves toward you, sound waves bunch up, making higher pitch. Moving away stretches waves, lowering pitch. This is how radar guns measure car speeds and how astronomers measure star velocities.