A steady beam of alpha particles (q = +2e) traveling with constant kinetic energy 20 MeV carries a current of 0.25?A.,(a) If the beam is directed perpendicular to a flat surface, how many alpha particles strike the surface in 3.0 s?,(b) At any instant, how many alpha particles are there in a given 20 cm length of the beam?,(c) Through what potential difference is it necessary to accelerate each alpha particle from rest to bring it to energy of 20 MeV?

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