An electron of mass $m$ and charge $e$ initially at rest gets accelerated by a constant electric field $E$. The rate of change of de-Broglie wavelength of the electron at time $t$ is (Ignore relativistic effect) ($h=$ Planck's constant).
- A$-\frac{h}{eEt^2}$
- B$-\frac{eEt}{h}$
- C$\frac{-mh}{eEt^2}$
- D$-\frac{h}{eE}$
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