Interactive Science exhibits, ideated and fabricated to inclucate and invigorate the young minds about Science !!
See beck siren
A model of siren is installed here. Rotate the perforated disc and observe.
What did you observe?
You can hear the sound generated by the set-up.
The science behind it :
When the perforated disc is rotated, air jet is allowed to pass through the holes simultaneously with the help of hose nozzle provided. The concept here is that when the air jet is interrupted by the mechanical means, sound is produced.