Posted: Nov 21, 2011 4:23 pm
cavarka9 wrote:PsYcHoTiC_MaDmAn wrote:twistor59 wrote:
As Tuco said above, you'd have to bore a straight line tunnel through the earth/mountains and lay some fibre optic cable along it. Bit tricky...
the optic fibre (OF) would slow it down as well
C = 299792458 m/s > 0.0024 seconds to travel the distance
OF = 299792458/1.538 = 194923575 m/s > 0.0038 seconds to travel the distance
so that wouldn't give an accurate figure (not sure what the longest a single fibre optic cable could be, so potentially requiring a splice or two (wiki says 40km link))
so that means you'd have to make a tunnel through the earth that is over 700km long, and make it a vacuum (so I'd assume that means something like steel pipe to stop gases venting from the rock)
you have still not got what the author is saying.While there could be many sources of errors.
We have a possible explanation for the source of error, which must be timing gone wrong due to error. So put the same timer mechanism for a fiber optic laser, take even this delay into account, synchronize via GPS, lay it over some 1 or 5km for 2 different places, then check it whether it comes before it was supposed to or not.
There can be only one true error which must be timer mechanism, i.e. it is detecting but calculations make it seem faster than it was supposed to. SO, something must be wrong with the calculation, they might not have considered everything. And so, use similar mechanism to check whether the same error persists, if it does, fine, else it is faster than light.
I think Psychotic's objection was to my ill-thought-out proposal for "sending photons along the same route as the neutrinos" as suggested by ihavenofingerprints. The idea, I believe was that you'd just compute the difference between (neutrino arrival time - neutrino departure time ) - (photon arrival time - photon departure time ). The problem that Psychotic pointed out was just that the speed of light through a fibre is not c.