The rest energy of an electron is 0.511 MeV. If the electron is
moving with a velocity v = 0.8 c,
where c is the speed of light in vacuum:
a) What is the relativistic mass of the electron for this
speed?
b) What is the total relativistic energy?
Data: Absolute value of electron charge e = 1.6 Ă— 10 ^ -19 C
Speed of light in vacuum c = 3 Ă— 10 ^ 8 m / s