Light, Sound and Waves

Spooky eye rolling

Stories from Physics for 11-14 14-16 IOP RESOURCES

Research by the American Air Force has found the resonant frequency of the human eyeball to be around 19 Hz. To determine that figure, 15 human volunteers were exposed to vertical vibrations in the range of 5-50 Hz and their eye movements were observed by monitoring reflection from the cornea.

This resonance may lead to the perception of unusual visual effects. Researchers have made the controversial claim that 19 Hz infrasound may be responsible for the perception of paranormal phenomena. Ultrasound waves were found to be present in areas of a 14th century cellar in Coventry where people had reported paranormal experiences.


is a special case of Oscillation
is exhibited by Resonating System
can be analysed using the quantity Resonant Frequency Natural Frequency
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