An alpha particle can be produced in certain radioactive decays of nuclei and consists of two protons and two neutrons. The particle has a charge of q = +2e and a mass of 4.00 u, where u is the atomic mass unit, with 1 u = 1.661 × 10–27 kg. Suppose an alpha particle travels in a circular path of radius 4.50 cm in a uniform magnetic field with B = 1.20 T. Calculate
(a) Its speed,
(b) Its period of revolution,
(c) Its kinetic energy, and
(d) The potential difference through which it would have to be accelerated to achieve this energy.