Forums: Science: PhysicsRepeat 'light speed neutrinos' test finds same result |  |
| Author | Message |
| SparklyKatie \m//O_O\\m/  Sheffield, United Kingdom | #16  Nov 18, 2011 @ 20:58:41 @jonnythan Said  The clocks you just linked to are about 1,000,000 times more accurate than necessary for this experimental result. The difference between what you linked to and GPS clocks is like the difference between measuring a decade with a watch with a second hand and a watch that only displays the month. You'll be able to tell if someone is 10 years late to the party with either one  Most people don't realize how accurate the clocks in GPS satellites have to be. GPS literally requires super-accurate clocks to even work - every GPS satellite has an atomic clock onboard. They have to, because they're measuring how long it takes signals traveling near the speed of light to get somewhere, within a few feet of accuracy. Yeah but GPS clocks need to be constantly adjusted more than earth based ones, otherwise positions would be out by hundreds of metres a day. The neutrinos travelled 'about' 732km in 0.0024 seconds. Without super accurate measurements of the distance the timing would be out by huge amounts. And the result was calculated after making over 15,000 measurements not just a handful. Maybe I'm not getting it but I was under the impression distances as well as timings need to be more accurate than GPS data can provide. | ||||||
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| jonnythan Bringer of rad mirth  Here and there, | #17 Feb 22, 2012 @ 21:39:55 | ||||||
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| Wheezy_Knight Deleted  Ankh-Morpork, United Kingdom | #18 Feb 22, 2012 @ 21:44:44I can't get the link to work Jonnythan. Does it say there was a loose cable causing the error? | |||||||
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| jonnythan Bringer of rad mirth Here and there, | #19 Feb 22, 2012 @ 21:51:04Yup. Delayed GPS signal I think. | ||||||
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| Wheezy_Knight Deleted Ankh-Morpork, United Kingdom | #20 Feb 22, 2012 @ 21:57:59Ty. Some might call that a fail on the part of the scientist. I don't. I say it just goes to show how accurate we've become, when an error that small can be measured. It also is a great kudos to the initial scientist that instead of jumping up and down saying "We've done it", they put all equipment and findings out there for scrutiny and destruct testing. Kudos to those guys.  | ||||||
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| jonnythan Bringer of rad mirth Here and there, | #21 Feb 22, 2012 @ 23:29:39"The 60 nanoseconds discrepancy appears to come from a bad connection between a fiber optic cable that connects to the GPS receiver used to correct the timing of the neutrinos' flight and an electronic card in a computer. After tightening the connection and then measuring the time it takes data to travel the length of the fiber, researchers found that the data arrive 60 nanoseconds earlier than assumed" So much for all that. | ||||||
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