Alpha particles of charge +2e and mass m are accelerated from rest through a potential difference V. Planck’s constant is h. Which of the following gives the de Broglie wavelength of the alpha particles as a result of the acceleration?

A. \(\frac{h}{{mV}}\)

B. \(\frac{h}{{\sqrt {4mVe} }}\)

C. \(\sqrt {2hmVe} \)

D. hmV

B