A group of high-school and college teachers and students have transmitted sound pulses faster than light travels at least according to one understanding of the speed of light. The results have conformed to Einstein’s theory of relativity. The work could help spur research that boosts the speed of electrical and other signals higher than before.
The standard metric for the speed of light is that of light traveling in vacuum. This constant, known as c, is roughly 186,000 miles per second, or roughly 1 million times the speed of sound in air. According to Einstein’s work, matter and signals cannot travel faster than c.
However, physicist William Robertson at Middle Tennessee State University in Murfreesboro, along with a high-school teacher, two college students and two high-school students, managed to, depending on how you look at it, transmit sound pulses faster than c using little more than a plastic plumbing pipe and a computer’s sound card.
“This experiment is truly basement science,” Robertson told LiveScience.
The key to understanding their results, reported online Jan. 2 in the journal Applied Physics Letters, is envisioning every pulse of sound or light as a group of intermingled waves. This pulse rises and falls with energy over space, with a peak of strength in the middle.
Robertson and his colleagues transmitted sound pulses from the sound card through a loop made from PVC plumbing pipe and connectors from a hardware store. This loop split up and then recombined the tiny waves making up each pulse. This led to a curious result. When looking at a pulse that entered and then exited the pipe, before the peak of the entering pulse even got into the pipe, the peak of the exiting pulse had already left the pipe.
If the velocities of each of the waves making up a sound pulse in this setup are taken together, the “group velocity” of the pulse exceeded c. “I believe that this is the first experimental demonstration of sound going faster than light,” Robertson said. Past research has proven it possible to transmit electrical and even light pulses with group velocities exceeding c.
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