An electron of mass m and charge e initially at rest gets accelerated by a constant electric field E. The de-Broglie wavelength of the electron at time t is (h = Planck's constant)

Step-by-step solution

The force acting on the electron in a constant electric field is F = eE Since the electron is initially at rest, its momentum at time t is p = Ft = eEt The de-Broglie wavelength is given by = h p Substituting the value of momentum, we get = h eEt Answer: h eEt