If we accelerate a particle in LHC Accelerator to 99.9999991% of speed of light, and add during the experiment a beam of light to that speedway, what velocity of photon from that lightbeam would be seen by particle?
a) speed of light is the same for all observers
b) particle will see photon moving 0,0000009% faster
.
if (a) what sense for particle is to compete with photon at all