An electron accelerated through a potential difference V_1 has a de-Broglie wavelength of λ. When the potential is changed to V_2, its de-Broglie…

An electron accelerated through a potential difference $\displaystyle V_1$ has a de-Broglie wavelength of $\displaystyle \lambda$. When the potential is changed to $\displaystyle V_2$, its de-Broglie wavelength increases by $\displaystyle 50 \%$. The value of $\displaystyle \left(\frac{V_1}{V_2}\right)$ is equal to