A What Is The Speed V Of Electron Whose

(a) What is the speed v of an electron whose kinetic energy is 14,000 times its rest energy? You can state difference, c-v such speeds are reached in the Stanford linear accelerator, SLAC,
(b) If the electrons travels in the lab through a tube 3.0km ling (as at SLAC), How long is this tube in the electrons’ reference frame?

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