What is the de Broglie wavelength of an electron accelerated from rest through a potential increase of 125 V?

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(a) What is the de Broglie wavelength of an electron accelerated from rest through a potential increase of 125 $\mathrm{V} ?$ (b) What is the de Broglie wavelength of an alpha particle $(q=+2 e,$ $m=6.64 \times 10^{-27} \mathrm{kg} )$ accelerated from rest through a potential drop of 125 $\mathrm{V} ?$