South Africa Flag logo

South African Skeptics

April 02, 2020, 15:39:55 PM
Welcome, Guest. Please login or register.
Did you miss your activation email?

Login with username, password and session length
Go to mobile page.
News: Please read the forum rules before posting.
   
   Skeptic Forum Board Index   Help Forum Rules Search GoogleTagged Login Register Chat Blogroll  
Pages: 1 [2]  All   Go Down
  Print  
Author Topic:

Faster than light?

 (Read 6826 times)
0 Members and 1 Guest are viewing this topic.
Mefiante
Defollyant Iconoclast
Hero Member
*****

Skeptical ability: +63/-9
Offline Offline

Posts: 3773


In solidarity with rwenzori: Κοπρος φανεται


WWW
« Reply #15 on: February 24, 2012, 09:15:26 AM »

Possible/probable flaws found in OPERA’s faster-than-light neutrino measurement.

'Luthon64
Logged
st0nes
Hero Member
*****

Skeptical ability: +10/-1
Offline Offline

Posts: 942



mark.widdicombe1
WWW
« Reply #16 on: February 24, 2012, 13:34:31 PM »

http://www.newsbiscuit.com/2012/02/23/faster-than-light-nissan-micra-%E2%80%98may-have-been-down-to-timing-fault%E2%80%99/
Logged
cyghost
Skeptically yours
Hero Member
*****

Skeptical ability: +12/-1
Offline Offline

Posts: 1410


Carpe diem


« Reply #17 on: February 25, 2012, 09:32:01 AM »

Well there you go, just a glitch in the matrix  Cheesy
Logged
Rigil Kent
Clotting Factor
Hero Member
*****

Skeptical ability: +20/-3
Online Online

Posts: 2488


Three men make a tiger.


« Reply #18 on: February 27, 2012, 09:16:41 AM »

LOL at the Micra article! Grin



But seriously, people are shooting lasers at the moon all the time .... why not simply have a laser beam accompany the stream of neutrinos as a speed-of-light control? That way, the clocks can be calibrated according to a known quantity.

Rigil.
Logged
st0nes
Hero Member
*****

Skeptical ability: +10/-1
Offline Offline

Posts: 942



mark.widdicombe1
WWW
« Reply #19 on: February 27, 2012, 09:26:23 AM »

LOL at the Micra article! Grin



But seriously, people are shooting lasers at the moon all the time .... why not simply have a laser beam accompany the stream of neutrinos as a speed-of-light control? That way, the clocks can be calibrated according to a known quantity.

Rigil.

Because the neutrinos go in a straight line through the Earth.  Light cannot be persuaded to behave similarly without constructing a tunnel.
Logged
Rigil Kent
Clotting Factor
Hero Member
*****

Skeptical ability: +20/-3
Online Online

Posts: 2488


Three men make a tiger.


« Reply #20 on: February 27, 2012, 09:30:02 AM »

Because the neutrinos go in a straight line through the Earth.  Light cannot be persuaded to behave similarly without constructing a tunnel.

Bloody technicalities, hey! Roll Eyes

Rigil
Logged
Mefiante
Defollyant Iconoclast
Hero Member
*****

Skeptical ability: +63/-9
Offline Offline

Posts: 3773


In solidarity with rwenzori: Κοπρος φανεται


WWW
« Reply #21 on: February 27, 2012, 09:49:53 AM »

Because the neutrinos go in a straight line through the Earth.  Light cannot be persuaded to behave similarly without constructing a tunnel.
Absolutely correct.  Unlike photons, neutrinos interact with matter only very, very weakly.  I remember a factoid from undergraduate physics lectures that to have a 1% chance of stopping a given neutrino, you would need a lead shield about 12,000 km thick (i.e. roughly the diameter of the Earth).  Lead atoms have the greatest known atomic cross-section for capturing radiation, which is why it is used for radioactive shielding.

If you are now wondering how the neutrinos are detected at the target end, you’ll have some idea of how technically challenging these experiments are.  In simple terms, the answer is in generating neutrino bursts numbering quadrillions of neutrinos (which requires lots of energy) and looking for particular types of subatomic events at the detector, after which a range of subtle statistical techniques come into the analysis.

'Luthon64
Logged
Superman
Full Member
***

Skeptical ability: +1/-0
Offline Offline

Posts: 170


« Reply #22 on: April 06, 2012, 19:06:47 PM »

Oh crap sorry tweefo. I should have searched the forum. I created a post about it also. I will see if I can delete mine.
Logged
Pages: 1 [2]  All   Go Up
  Print  


 
Jump to:  

Powered by SMF 1.1.11 | SMF © 2006-2009, Simple Machines LLC
Page created in 0.374 seconds with 23 sceptic queries.
Google visited last this page May 12, 2019, 07:18:52 AM
Privacy Policy