What is faster the speed of light or sound

The distance depends on the speed of sound in air. This speed varies slightly depending on the temperature, pressure and humidity. So plugging in the numbers you get meters, a tad over one mile. When there's a big lightning strike, you see it first, then hear it a little later.

Mike W. Katie, The time taken to reach a particular distance in most general sense depends on how fast someone is moving. 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. Past research has proven it possible to transmit electrical and even light pulses with group velocities exceeding c.

Robertson explained this faster-than-light acoustic effect is likely commonplace but imperceptible. For 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 sounds recombine at the listener," Robertson said. Sign in Register. Enter e-mail address Show Enter password Remember me.

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