Scientists Mess with the Speed of Light.Scientists Question Nature's Fundamental Laws.Light Travels Backward and Faster than Light.Robertson explained that although it is not possible to send information faster than light, it seems these techniques could make it possible to route slower-than-light signals in electronic circuits faster than before. Still, this research might have engineering applications. This means one could not, for instance, shout a message faster than light. In other words, Einstein's theory of relativity was preserved. None of the individual waves making up the sound pulses traveled faster than c. However, the weakness of the signals and the fact that any resultant differences in timing are very slight "mean that we would never be able to hear this effect." The sounds recombine at the listener," Robertson said. "Such 'split-path' interference occurs frequently in the everyday world."įor example: "When a sound source is located near a hard wall, some sound reaches the listener directly from the source whereas some sound travels the longer path that bounces the sound off the wall. "The loop filter that we used splits and then recombines sound along two unequal length paths," he said. Robertson explained this faster-than-light acoustic effect is likely commonplace but imperceptible. Past research has proven it possible to transmit electrical and even light pulses with group velocities exceeding c. "I believe that this is the first experimental demonstration of sound going faster than light," Robertson said. 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. 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. This loop split up and then recombined the tiny waves making up each pulse. 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 pulse rises and falls with energy over space, with a peak of strength in the middle. 2 in the journal Applied Physics Letters, is envisioning every pulse of sound or light as a group of intermingled waves. The key to understanding their results, reported online Jan. That may seem fast, yet when compared to the speed of light, it seems quite small. In Earth’s atmosphere, the speed of sound averages at about 761-miles per hour (1,225-kilometres per hour). "This experiment is truly basement science," Robertson told LiveScience. The first notable difference between the speed of sound and light is how fast they are.
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