[单选题]
A stationary electron is accele 5 vb70ocka7qlra+ 6fl1n:jcd vxted through a potential difference of 500 V. Whatlx+61c: jf dnv is the velocity of the electron afterward?
A. $1.3 \times 10^{6} \; m/s$
B. $2.6 \times 10^{6} \; m/s$
C. $1.3 \times 10^{7} \; m/s$
D. $2.6 \times 10^{7} \; m/s$
