This demonstration uses a tube with two open ends to create standing waves inside the tube, which in turn creates a tone. The yellow tube is a toy version and the black tube is corrugated pipe. When the toy is spun the air moving past it on the outside creates a resonance vibration inside the tube [much like blowing across the top of a pop bottle]. These vibrations are restricted to specific wavelenghts [which genearates tones at specific frequencies], faster or slower rotations produce no sound or sounds up or down an octave. The wavelenghts of the notes are related to the length of the tube.
30 turns and still standing!!
planmix 1 year ago
stop laughing you morons, i want to hear the sound
nonamesleft87 1 year ago
wow what a balance!
I'm impressed :)
KakHazhar 1 year ago