1. The problem statement, all variables and given/known data A proton is accelerated from rest through a potential of 1kV. Find its de Broglie wavelength. 2. Relevant equations [tex]\lambda=h/p[/tex] 3. The attempt at a solution I tried to get p (momentum) by energy comparison: e*1000=0.5*m*v^2 v=437 621.130 016 524 m/s which doesn't makes sense... what am I doing wrong?