4/16/2023 0 Comments Soundwaves orgThe researchers suggest that experiments may soon be able to detect whether this effect is real. However, since this work suggests that all sound waves have negative gravitational mass, they should gravitationally attract each other, the researchers added. "It follows that if I generate a sound wave traveling, say, horizontally in a standard material, this will tend to bend its path upward - float - under the influence of the Earth's gravitational field," said Esposito. However, positive gravitational mass repels negative gravitational mass instead of attracting it. All known matter has positive gravitational mass, and such masses attract each other. These findings not only suggest that sound has gravitational mass, but that such mass is negative. According to the researchers' equations, sound that carries one watt of power for one second in air - comparable to that from heavy thunder - will generate an equivalent of 10 milligrams of gravitational mass. Now, Esposito and his colleagues have found that sound waves traveling in more familiar materials such as solids and fluids also may possess gravitational mass, which means they respond to gravitational fields like matter does. In 2018, researchers reported sound waves in superfluid helium might interact with gravity in ways that require they possess mass. Liquid helium can act like a superfluid when cooled to temperatures just a few degrees above absolute zero. However, this view began to change when scientists investigated a very slippery kind of fluid known as a superfluid, which flows with virtually zero friction or viscosity. In classical physics, their energy can make matter move back and forth, but they were not thought to possess mass. Sound waves are fluctuations of density within materials. "It's surprising in this day and age that it is still possible to find new results in classical Newtonian physics," said particle physicist Ira Rothstein at Carnegie Mellon University in Pittsburgh, who did not take part in this study. Still, the finding challenges long-held assumptions about how sound works. "It is a tiny, tiny effect," said study lead author Angelo Esposito, a high-energy physicist at the Swiss Federal Polytechnic School of Lausanne. However, these new findings suggest that even in regular conditions that ignore relativity, sound possesses gravitational mass.Īny sound waves on Earth would have extraordinarily weak gravitational effects on their surroundings compared to the effect of the Earth itself, which has a mass of about 6 trillion trillion kilograms. One consequence of this relationship according to Einstein's theory of relativity is that matter traveling near the speed of light will get heavier. One might assume these findings are related to Einstein's famous equation E=mc 2, which revealed that anything with energy could be converted to an equivalent amount of mass and vice versa. Oddly, the findings also suggest the pull is in the opposite direction of the gravitational pull generated by normal matter, meaning sound waves might fall up instead of down in Earth's gravitational field. (Inside Science) - The sound of a sonic boom may produce about the same magnitude of gravitational pull as a 10-milligram weight, a new study finds.
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