If an electron initially at rest is subjected to a uniform electric field of \(4125\ \mathrm{NC^{-1}}\), then the de Broglie wavelength associated with the electron at time \(t=2\times10^{-9}\) s is
\[
(\text{Planck's constant}=6.6\times10^{-34}\ \mathrm{Js})
\]
Show Hint
For a charged particle initially at rest in a uniform electric field,
\[
\boxed{
p=eEt.
}
\]
Then use the de Broglie relation
\[
\boxed{
\lambda=\frac{h}{p}.
}
\]