I Relativistic velocities of elementary particles

Can we compute the relativistic velocities of 2 photons or 2 neutrinos ? :))
 

jbriggs444

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Can we compute the relativistic velocities of 2 photons or 2 neutrinos ? :))
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?
 
Any two that originate from the same source.
 
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The speed of photons is c. Neutrinos may have any speed < c.
 
The speed of photons is c. Neutrinos may have any speed < c.
Does this imply that neutrinos have rest mass ?
 

Orodruin

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Does this imply that neutrinos have rest mass ?
The implication goes in the other direction. Neutrinos have mass, therefore they can have any speed < c.
 

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