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Police car siren

K004/4366

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Credit

RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY

Caption

Police car siren demonstrating the Doppler effect. As the police car moves, the sound waves from the siren become spread out behind it and compressed in front of it. This creates a change in pitch as the vehicle moves past an observer. It will sound higher in pitch as it is approaching the observer and lower in pitch as it is receding from the observer.

Release details

Model release not required. Property release not required.

Downloadable Master

  • Duration: 00:00:27
  • Audio: Yes
  • Format: Photo JPEG 100% QuickTime movie

Original

  • Capture Format: Sony FS700

Contact us if you require the original or other formats.

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