Quote:
Originally Posted by Syrinx1
...effects such as intermodulation can create sensory artifacts from frequencies which are beyond our senses' ability to resolve directly...
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That's interesting. I've often wondered whether it's possible to hear the beat frequencies arising from large numbers of bats flying together, as often depicted in films. I've never experienced it myself, and have sort-of concluded that the mass and inertia of the eardrum are just too large to move at anything above 20kHz, as the mixing would have to occur inside the ear rather than in the air outside it, but I'm willing to be proved wrong!
Would looking at two ultraviolet sources with a frequency difference in the visible range give rise to a visible effect?