Hby
The Doppler effect
Doppler effect
The Doppler effect
all you have to do is stop the car and get out of the car and listen to the police siren
Almost every emergency vehicle is equipped with a siren.
weuweu
A siren.
Lights, and Siren.
gayness
jhon robison
A Siren....but the different tones of a siren are Wail, Yelp, Hi-Lo, Hyper Yelp, and the Air Horn. Loudness of a siren is between 110-130 db
it is used to generate 4 kinds of sounds-police siren,fire alarm,ambulance and gun siren