An electron traveling at 0.980c has a total energy of
A) 0.245 MeV.
B) 0.511 MeV.
C) 0.756 MeV.
D) 1.736 MeV.
E) 2.567 MeV.

Question

Quizplus · Accepted Answer

The total energy of an electron moving at relativistic speeds is given by E = γmc², where γ is the Lorentz factor. For an electron at 0.980c, γ ≈ 5.025. The rest energy of an electron is 0.511 MeV, so the total energy is approximately 5.025 * 0.511 MeV = 2.567 MeV.

An Electron Traveling at 0