An alpha particle (q = +2e, m = 4.00 u) travels in a circular path of radius 6.41 centimeter in a uniform magnetic field with B = 0.961 T.
(a) Determine its speed,
(b) Determine its period of revolution,
(c) Determine its kinetic energy (in eV), and
(d) Determine the potential difference (in V) through which it would have to be accelerated to achieve this energy.