College Physics 10th Edition by Raymond Serway,Chris Vuille

Exercise 39

The rest energy of an electron is 0.511 MeV. The rest energy of a proton is 938 MeV. Assume both particles have kinetic energies of 2.00 MeV. Find the speed of (a) the electron and (b) the proton. (c) By how much does the speed of the electron exceed that of the proton Note: Perform the calculations in MeV; don't convert the energies to joules. The answer is sensitive to rounding.