Dual Nature Of Radiation

An electron accelerated through a potential difference '\(V_1\)' has a de-Broglie wavelength '\(\lambda\)'. When the potential is changed to '\(V_2\)' its de-Broglie wavelength increases by \(50 \%\). The value of \(\left(\frac{\mathrm{V}_1}{\mathrm{~V}_2}\right)\) is