An ion source produces a beam of doubly-charged magnesium ions (Mg2+\text{Mg}^{2+}Mg2+). The current of the beam is 4.8 μA4.8\,\mu\text{A}4.8μA.
How many magnesium ions strike a target in a time interval of 5.0 minutes5.0\text{ minutes}5.0 minutes?
7.5×10137.5 \times 10^{13}7.5×1013
4.5×10154.5 \times 10^{15}4.5×1015
9.0×10159.0 \times 10^{15}9.0×1015
1.5×10141.5 \times 10^{14}1.5×1014
