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quote:Originally posted by ukmickybut i would of never of guessed that you the man with your experience (3065 posts)would find the second link hard to understand
quote:Originally posted by neilepThanks for the links Michael...the second one is a bit heavy reading for little ole me !!..I was hoping for a laymans answer, one that you might find in 'John & Jane learn about Neutinos' or 'Sesame Street is brought to you today by the word Neutrino'...but thanks again...all very interesting stuff.Men are the same as women.... just inside out !!
quote:Originally posted by Solvay_1927After a lengthy break, I've come back to considering this topic again, and something's just struck me.(ouch)A neutrino and anti-neutrino can annihilate to form a positron and an electron.But photons also produce electrons and positrons.So does this mean that photons can be considered to be made up of a combination (some sort of "resonance" or something) of a neutrino and an antineutrino?Or am I just being really thick?
quote:Originally posted by David SparkmanThanks for clearing that up. I was reading up on quarks recently and found some curious ideas that Halons weigh more than their composite quarks due to the extra energy they have in them. Can you shead any light on those theories?David
quote:Originally posted by Atomic-SIn re. the production of electron-positron pair mentioned by someone above, that it takes place only near matter:Converting an electron and positron into gamma rays by annihilation does not require the presence of additional particles. I understand that the mathematics of all this is reversible. If so, it should be possible, under certain circumstances, for 2 photons to come together and turn into an electron and positron speeding away from each other and not recombining. I don't think it has ever been observed, but theory seems to say it should be possible.
quote:Originally posted by Solvay_1927gsmollin - thatnks for your answers above - you're a very useful guy to have around. (Or is it gal?)Maybe you - or someone - can help me with another query about neutrinos: What wavelengths are associated with neutrinos?If neutrinos have mass (as per latest theory/experiments - see gsm's link earlier in this discussion), then can we use the de broglie equation to obtain their compton wavelength:w=h/mc ?And if they don't have mass, would it be possible/meaningful to treat neutrinos as if they were light, and use E=hf followed by w=c/f ?In either case, what range of wavelengths would this give?(P.S. Does anyone know how to insert greek letters - e.g. lamda - in these replies??)
quote:Two photons coming together does not normally result in a reaction. Since the photon is a boson, it can co-exist with another photon, i.e. two photons can pass through each other without colliding.