Задача id16772

In the ultrarelativistic case, the momentum of a particle accelerated by a potential difference fi is found by the formula p==e·fi/с, where e·fi is expressed in MeV, c is the speed of light in vacuum. Express p in SI units. Determine at what potential difference the use of this formula gives an error not exceeding 5%. Do the calculations for an electron and a proton.

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