A "certified sound therapist," Mr. Mazursky said he uses Tibetan singing bowls and a giant earth gong to send vibrations through the water at specific frequencies.
Helmholtz conjectured that the length of the fibres tunes them to vibrate at specific frequencies.
An antenna also may be designed to transmit at specific frequencies.
Some explanations appeal to the suggestion that because the vibrations occur at specific frequencies (around 7 Hz), then they may interfere with patterns of brain activity called alpha waves, which occur at about the same frequency.
Professor Pound was a member of the Harvard team that discovered nuclear magnetic resonance, by which atomic nuclei can be coaxed into absorbing and emitting energy at specific frequencies, leading to a new era of three-dimensional medical imaging.
He arranged the solar panels, connected them to a box of batteries and sent power to the instruments: a sound level meter that continuously logs decibels at specific frequencies and an audio recorder.
The bandgap at specific frequencies and noise reduction at high frequencies were investigated.
Rotating mechanical systems such as gearbox are known to generate vibrations at specific frequencies.
