Tag Archives: Holes in a Spinning Cylinder
How does a siren work?
askpari ♦ September 16, 2012 ♦ Leave a comment
A siren is a kind of whistle which makes a loud noise as air is blown through holes in a spinning cylinder or disk. It is a wailing noise When a fire truck roars through the streets, its loud siren warms people to get out of the way. An ordinary air siren has two cylinders, …