A steady beam of alpha particles (q = + 2e, mass m = 6.68 × 10°27 kg) traveling with constant kinetic energy 18 MeV carries a current of 0.20 µA. (a) If the beam is directed perpendicular to a flat surface, how many alpha particles strike the surface in 3.7 s? (b) At any instant, how many alpha particles are there in a given 27 cm length of the beam? (c) Through what potential difference in volts is it necessary to accelerate each alpha particle from rest to bring it to an energy of 18 MeV?

A steady beam of alpha particles (q = + 2e, mass m = 6.68 × 10°27 kg) traveling with constant kinetic energy 18 MeV carries a current of 0.20 µA. (a) If the beam is directed perpendicular to a flat surface, how many alpha particles strike the surface in 3.7 s? (b) At any instant, how many alpha particles are there in a given 27 cm length of the beam? (c) Through what potential difference in volts is it necessary to accelerate each alpha particle from rest to bring it to an energy of 18 MeV?