An electron is accelerated from rest through a potential difference of $V$ volt. If the de Broglie wavelength of the electron is $1.227\times 10^{-2}nm$, the potential difference is :

An electron of mass $9.1\times 10^{-31}$kg and charge $1.6\times 10^{-19}$C is accelerated through a potential difference of 'V' volt. The de Broglie wavelength $(\lambda )$ associated with the electron is