Neutrinos

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Offline syhprum

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Neutrinos
« on: 30/12/2007 08:25:57 »
At what speed do Neutrinos travel, by definition as they have some mass they cannot travel at "c" also they are believed they transmute into there three different 'flavours, each of different mass which would seem to mean that their speed varies as they travel.
There is some evidence as to their speed from a supernovae event where a Neutrino burst was detected a little while after the the optical signal but this gave little evidence as to their mass or speed
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another_someone

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Neutrinos
« Reply #1 on: 30/12/2007 11:05:40 »
How could one possibly tell what their instantaneous speed might be if the speed is variable?

One can tell the distance and time between the reaction which generated them and the reaction that stopped them, but how could one possibly say along the way what has happened to them without first stopping them, and so making any further measurement meaningless?

Even the notion that they transmute between one and another form is only meaningful insofar as one may determine the form they start with and the form they finish with, but how could you possibly say what form they have in between without first stopping them en route?

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Offline Soul Surfer

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Neutrinos
« Reply #2 on: 30/12/2007 16:43:03 »
The neutrino mass is so small that to all intents and purposes they travel at the speed of light with almost any amount of energy.  ie 99.999...% of the speed of light under almost all circumstances.
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