(a) What is the speed v of an electron whose kinetic energy is 14,000 times its rest energy? You can state the answer as the difference с – v. Such speeds are reached in the Stanford Linear Accelerator, SLAC. (b) If the electrons travel in the lab through a tube 3.0 km long (as at SLAC), how long is this tube in the electrons’ reference frame? [Hint: Use the binomial expansion.]
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