If A $\mathrm { Cu } ^ { 2 + }$

Multiple Choice

If a $\mathrm { Cu } ^ { 2 + }$ ion that is initially at rest accelerates through a potential difference of $12 \mathrm {~V}$ without friction, how much kinetic energy will it gain? $\left( e = 1.60 \times 10 ^ { - 19 } \mathrm { C } \right)$

A) $12 \mathrm { eV }$ .
B) $3.0 \mathrm { eV }$ .
C) $6.0 \mathrm { eV }$ .
D) $24 \mathrm { eV }$ .