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An electron (mass \( m \) ) with an initial velocity \( \vec{v}=v_{0} \hat{i} \)
\( \mathrm{P} \)
is in an electric field \( \vec{E}=E_{0} \hat{j} \). If \( \lambda_{0}=h / m v_{0} \), it's de-
W
Broglie wavelength at time \( t \) is given by
(1) \( \lambda_{0} \)
(2) \( \lambda_{0} \sqrt{1+\frac{e^{2} E_{0}^{2} t^{2}}{m^{2} v_{0}^{2}}} \)
(3) \( \frac{\lambda_{0}}{\sqrt{1+\frac{e^{2} E_{0}^{2} t^{2}}{m^{2} v_{0}^{2}}}} \)
(4) \( \frac{\lambda_{0}}{\left(1+\frac{e^{2} E_{0}^{2} t^{2}}{m^{2} v_{0}^{2}}\right)} \)
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