Giant tuning fork, barely audible, displayed with stroboscope.

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(B)Waves - B+45: Sound Spectrum/Sources

InfraSound: Giant Tuning Fork,-barely in audible range. The sound generated by this giant tuning fork is barely in the audible range. The motion of the tines of the fork can be shown with a stroboscope.
UCB Index: 
B+45+5
PIRA Index: 
3D46.40
Demo Diagram: 

UCB Taxonomy:

PIRA Taxonomy:

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B+45+0 Steel spring pendulum, inverted, vibrates at 10 Hz.
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B+45+10 Ultrasound transducers (40 kHz) as both sources and receivers.