| ??? 05/01/07 20:54 Read: times |
#138412 - very off topic puzzler faster than light signals? |
I was asked this today and I think I know the answer,but,
someone asked me if you hold a long stiff rod of some material such as a pencil in your fingers and you push on one end so it slips through your fingers havent you just transmitted information at not only greater than light speed but possibly infinite speed ? I said the answer was that no you havent because the rod of whatever it is gets compressed so the information thats transmitted is actualy a shock wave travelling at some sub-light speed through the material.It sounds suspiciously like spinning a torch round the inside of a large enough sphere to get a spot of light moving at faster than light speeds on the wall of the sphere.Something to do with the difference between a signal and information. |
| Topic | Author | Date |
| very off topic puzzler faster than light signals? | 01/01/70 00:00 | |
| suspicious? | 01/01/70 00:00 | |
| yeah i thought that it would be speed of sound | 01/01/70 00:00 | |
| Kind of like ... | 01/01/70 00:00 | |
| oh yes and that's not even quanto-relativistic... | 01/01/70 00:00 | |
| It is information ... | 01/01/70 00:00 | |
could see the other end move without light. | 01/01/70 00:00 | |
| No FTL allowed | 01/01/70 00:00 |