MrBentor
join:2003-02-18
Seattle, WA
 ·Comcast
| The density and refractive characteristics of water in the pipe (waveguide) would tend to block or attenuate the signal. If the pipe were empty (vacuum), or filled with a light gas like air, or methane (natural gas) then you can use the metal pipe as a waveguide - radio signal would propagate, bouncing down the inside of the pipe. (Note - in a waveguide the signal doesn't crawl along the metal like electricity would, instead it acts somewhat in the way optical fiber would bouncing along the inside core.
See »en.wikipedia.org/wiki/Waveguide for some more information. |
