An electron (mass m) with an initial velocityv=v_{0} \hat{i} \text { is in an electric field } E=E_{0} \hat{j}. If λ_0= h/mv_0, it’s de Broglie wavelength at time t is given bya) \Lambda_{0} b) \lambda_{0} \sqrt{1+\frac{e^{2} E_{0}^{2} t^{2}}{m^{2} v_{0}^{2}}} c) \frac{\lambda_{0}}{\sqrt{1+\frac{e^{2} E_{0}^{2} t^{2}}{m^{2} v_{0}^{2}}}}d ) \frac{\lambda_{0}}{1+\frac{e^{2} E_{0}^{2} t^{2}}{m^{2} v_{0}^{2}}}