An alpha particle (charge +2e, mass 6.64×10−27kg) is initially at rest at the entrance to a linear accelerator in which each gap provides an accelerating potential difference of 1.80 kV. What is the minimum number of gaps the alpha particle must traverse to reach a speed of at least 3.0×106m⋅s−1?
a) 36
b) 52
c) 104
d) 26