De Broglie wavelength of an electron moving in an electric or magnetic field after time t

1. A.
   $\lambda_{0}$
2. B.
   $\lambda_{0}\left( 1 + \frac{{eE}_{0}t}{{mv}_{0}} \right)$
3. C.
   $\lambda_{0}t$
4. D.
   $\frac{\lambda_{0}}{\left( 1 + \frac{{eE}_{0}t}{{mv}_{0}} \right)}$

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1. A.
   $\frac{\lambda_{0}}{\sqrt{1 + \frac{e^{2}E_{0}^{2}t^{2}}{{\text{ }m}^{2}v_{0}^{2}}}}$
2. B.
   $\frac{\lambda_{0}}{\sqrt{1 - \frac{e^{2}E_{0}^{2}t^{2}}{m^{2}v_{0}^{2}}}}$
3. C.
   $\lambda_{0}$
4. D.
   $\lambda_{0}\sqrt{1 + \frac{e^{2}E_{0}^{2}t^{2}}{{\text{ }m}^{2}v_{0}^{2}}}$

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1. A.
   $\frac{\lambda_{0}}{\sqrt{1 - \frac{e^{2}{\text{ }B}_{0}^{2}t^{2}}{{\text{ }m}^{2}}}}$
2. B.
   $\frac{\lambda_{0}}{\sqrt{1 + \frac{e^{2}{\text{ }B}_{0}^{2}t^{2}}{{\text{ }m}^{2}}}}$
3. C.
   $\lambda_{0}\sqrt{1 + \frac{e^{2}{\text{ }B}_{0}^{2}t^{2}}{{\text{ }m}^{2}}}$
4. D.
   $\lambda_{0}$

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1. A.
   $\frac{4\lambda_{0}}{\left\lbrack 1 - \frac{E_{0}e}{2m}\frac{t}{v_{0}} \right\rbrack}$
2. B.
   $\frac{4\lambda_{0}}{\left\lbrack 1 + \frac{E_{0}e}{2m}\frac{t}{v_{0}} \right\rbrack}$
3. C.
   $\frac{4\lambda_{0}}{\left\lbrack 1 + \frac{2E_{0}e}{m}\frac{t}{v_{0}} \right\rbrack}$
4. D.
   $\frac{4\lambda_{0}}{\left\lbrack 1 - \frac{2E_{0}e}{m}\frac{t}{v_{0}} \right\rbrack}$

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