Question

2. An electron travelling with a speed of 5 x 103 m/s passes through an electric field with an acceleration of 1012 m /s2. How long will it lake for the electron to double its speed?

Answer 1

For an electron with KE = 1 eV and rest mass energy 0.511 MeV, the associated DeBroglie wavelength is 1.23 nm, about a thousand times smaller than a 1 eV photon. ... The following calculation uses the full relativistic expressions for kinetic energy, etc.