\(\lambda  = \frac{h}{p} = \frac{h}{{\sqrt {2mk} }} = \frac{h}{{\sqrt {2meV} }}\,\,\,\, = \,\,\,\frac{{{h^2}}}{{{\lambda ^2}}} = 2meV\)

\(V = \frac{{{h^2}}}{{2{\lambda ^2}{m_e}e}}\)

\( = \frac{{{{(6.6 \times {{10}^{ - 34}})}^2}}}{{2 \times {{10}^{ - 20}} \times 1.6 \times {{10}^{ - 19}} \times 9.1 \times {{10}^{ - 31}}}}\,\,\, = \,\,150\,volt\)