An electron of mass m is moving in an electric field \(\vec{E}=-2{E}_{\mathrm{o}}\overset{^}{i}\left({\mathrm{E}}_{\math…

An electron of mass m is moving in an electric field \(\vec{E}=-2{E}_{\mathrm{o}}\overset{^}{i}\left({\mathrm{E}}_{\mathrm{o}}=\text{ constant }>0\right),\) with an initial velocity \(\vec{V}={v}_{\mathrm{o}}\overset{^}{i}\left({v}_{\mathrm{o}}=\text{ constant }>\right.\)\(0)\text{. If }{\lambda }_{\mathrm{o}}=\frac{h}{4m{v}_{\mathrm{o}}}\text{, }\) its de Broglie wavelength at time t is ________. (e = charge of electron).

[JEE Main 2026, 5 Apr (Shift 1)]