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I Relativistic velocities of elementary particles

  1. Nov 8, 2016 #1
    Can we compute the relativistic velocities of 2 photons or 2 neutrinos ? :))
  2. jcsd
  3. Nov 8, 2016 #2


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    Can you give a little context? What do you mean by "relativistic velocity" and which two photons or which two neutrinos do you have in mind?
  4. Nov 8, 2016 #3
    Any two that originate from the same source.
  5. Nov 8, 2016 #4


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    The speed of photons is c. Neutrinos may have any speed < c.
  6. Nov 14, 2016 #5
    Does this imply that neutrinos have rest mass ?
  7. Nov 14, 2016 #6


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    The implication goes in the other direction. Neutrinos have mass, therefore they can have any speed < c.
  8. Nov 14, 2016 #7


    Staff: Mentor

    Yes, neutrinos have rest mass.
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