Name: Police car siren
Uploaded: 2014-09-01
Duration: 27 s
Description: 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.

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Police car siren

Référence de la vidéo 11938477

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.
Licence :	Droits gérés
Crédit :	Science Photo Library / RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA
Model Release :	Non requis
Durée :	27 Secondes
Aspect ratio :	16/9
Restrictions :	-

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Publicité (Communication d'entreprise etc) À partir de 70 €

Rédactionnel (Sites web multiples etc) À partir de 125 €

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Mots-clés

à l'extérieur,
adoption,
approcher,
Australie,
australien,
dehors,
effet doppler,
extérieur,
fréquence,
mouvement,
ondes sonores,
passer,
physique,
pitch,
recul,
route,
service des urgences,
sirène,
son,
source,
terrain,
véhicule,
véhicule de secours,
voiture de police