2023-08-09 17:11:40
Sound waves passing through a vacuum – UNIVERSITY OF JYVÄSKYLÄ
MADRID, 9 Ago. (EUROPA PRESS) –
Physicists of the University of Jyväskylä (Finland) have shown that in certain situations, sound can be strongly transmitted through a region of vacuum.
In a recent article published in Communications Physicsphysicists Zhuoran Geng and Ilari Maasilta show that, in some cases, a sound wave can jump or “tunnel” completely through a vacuum space between two solids. if the materials in question are piezoelectric. In such materials, vibrations (sound waves) also produce an electrical response, and since an electric field can exist in a vacuum, can transmit sound waves.
The requirement is that the size of the space is smaller than the wavelength of the sound wave. This effect works not only in the audio frequency range (Hz-kHz), but also in ultrasonic (MHz) and hypersound (GHz) frequencies, as long as the vacuum gap gets smaller as the frequencies increase.
“In most cases, the effect is small, but we also found situations where the full energy of the wave jumps through a vacuum with 100% efficiency, without reflections. As such, the phenomenon could find applications in microelectromechanical components (MEMS, smartphone technology) and in heat control,” says it’s a statement Professor Ilari Maasilta from the Center for Nanoscience at the University of Jyväskylä.
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