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An eleciron (mass \( m \) ) with an initial velocity \( v=v_{0} i\left(v_{0}0\right) \) is in an electric field \( \vec{E}=-E_{0} \hat{i} \quad\left(E_{0}=\right. \) constant \( \left.0\right) \). It's
\( \mathrm{P} \) de-Broglie wavelength at time \( t \) is given by

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[NCERT Exemplar, NEET 2018]
(a) \( \frac{\lambda_{0}}{\left(1+\frac{e E_{0}}{m} \frac{t}{v_{0}}\right)} \)
(b) \( \lambda_{0}\left(1+\frac{e E_{0} t}{m v_{0}}\right) \)
(c) \( \lambda_{0} \)
(d) \( \lambda_{0} t \)
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