A positively charged particle of charge q and mass m is accelerated from rest through a potential V. After acceleration the de Broglie wavelength of the particle is λ. Which of the following is equal to λ?

A. \(\frac{h}{{\sqrt {2mqV} }}\)

B. \(\frac{h}{{\sqrt {mqV} }}\)

C. \(\frac{{hq}}{{\sqrt {2mV} }}\)

D. \(\frac{{hm}}{{\sqrt {2qV} }}\)

A