Rubens' Tube - Resonator Demonstrator
See what's going on inside a resonator.
I stumbled on this video. It demonstrates standing waves inside a tube closed at one end, just like vibraphone resonators.
There is a speaker on one end, connected to a tone generator (single frequency). The tube has holes along its length. Flamable gas flows through the tube. The holes are lit. The flame height is proportional to the air pressure at different locations inside the resonator.
The interesting part starts at 3:33.
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