Credit: 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.

Keywords: approaching, australia, australian, doppler effect, doppler shift, emergency service, emergency vehicle, frequency, movement, outdoors, outside, passing, physical, physics, pitch, police car, receding, road, siren, sound, sound waves, source, vehicle, wave-front, wavefront

Licence fees: A licence fee will be charged for any media (low or high resolution) used in your project.

Police car siren

K004/4366 Rights Managed

Downloadable master

Duration: 00:00:27

Frame size: 1920x1080

Frame rate: 25

Audio: Yes

Format: QuickTime, Photo JPEG 100%, progressive scan, square pixels

File size: 1.0G

Original

Capture format: Sony FS700

Codec: Apple ProRes 422 HQ

Interlaced: Yes

Please contact Science Photo Library if you require the original, or other formats.

 

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