It took a few tries, but I got Wolfram Alpha to compute its velocity compared to the speed of light[1].
I started with:
sqrt(1-((1/(1+120 PeV / (neutrino mass * c^2)))^2))
but it simply said "data not available". So I changed:
120 PeV to 120e15 * 1.602176634e-19 kg m^2 s^-2
neutrino mass to 1.25e-37kg
speed of light to 299792458 m/s
and finally it gave a numeric result:
0.999999999999999999999999999999999999829277971
(that's 36 nines in a row). Pasting it in Google says the value is "1", which is… not far off.
If you want details about the way this is calculated, I dug up the formula from an article I'd written about particle velocities in the LHC, back in 2008[2]. For comparison, their 7 TeV protons were going at 0.999999991 × c.
[1] https://www.wolframalpha.com/input?i=sqrt%281-%28%281%2F%281...
[2] https://log.kv.io/post/2008/09/12/lhc-how-fast-do-these-prot...
I started with:
but it simply said "data not available". So I changed: and finally it gave a numeric result: (that's 36 nines in a row). Pasting it in Google says the value is "1", which is… not far off.If you want details about the way this is calculated, I dug up the formula from an article I'd written about particle velocities in the LHC, back in 2008[2]. For comparison, their 7 TeV protons were going at 0.999999991 × c.
[1] https://www.wolframalpha.com/input?i=sqrt%281-%28%281%2F%281...
[2] https://log.kv.io/post/2008/09/12/lhc-how-fast-do-these-prot...