An electron of mass m with an initial velocity V =V 0 i ( V 0 > 0 ) enters an electric field E =-E 0 i ( E 0 = constant > 0 ) at t = 0. If 0 is its de-Broglie wavelength initially, then its de-Broglie wavelength at time t is

1. A. 0 t
2. B. 0 (1+ eE 0 mV 0 t )
3. C. 0 (1+ eE 0 mV 0 t )
4. D. 0

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