The ratio of de-Broglie wavelength of an α particle and a proton accelerated from rest by the same potential is 1/(√ m), the value of m is-

The ratio of de-Broglie wavelength of an $\displaystyle \alpha$ particle and a proton accelerated from rest by the same potential is $\displaystyle \frac{1}{\sqrt{m}}$, the value of $\displaystyle m$ is-