An electron (mass m ) with an initial velocity v =v_0 i (v_0>0) is moving in an electric field E =-E_0 i (E_0>0) where E_0 is constant. If at t =0 de…

An electron (mass m ) with an initial velocity $\displaystyle \vec{v}=v_0 \hat{i}\left(v_0>0\right)$ is moving in an electric field $\displaystyle \vec{E}=-E_0 \hat{i}\left(E_0>0\right)$ where $\displaystyle \mathrm{E}_0$ is constant. If at $\displaystyle \mathrm{t}=0$ de Broglie wavelength is $\displaystyle \lambda_0=\frac{h}{m v_0}$,then its de Broglie wavelength after time t is given by