A steady beam of alpha particles (q = + 2e, mass m = 6.68 × 10-27 kg) traveling with constant kinetic energy 30 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 4.3 s? (b) At any instant, how many alpha particles are there in a given 25 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 30 MeV?

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During the 4.8 min a 7.0 A current is set up in a wire, how many (a) coulombs and (b) electrons pass through any cross section of the wire's width?

Energetic particles, such as protons, can be detected with a silicon detector. When a particle strikes a thin piece of silicon, it creates a large number of free electrons by ionizing silicon atoms. The electrons flow to an electrode on the surface of the detector, and this current is then amplified and detected. In one experiment, each incident proton creates, on average, 37,000 electrons; the electron current is amplified by a factor of 100; and the experimenters record an amplified current of 3.5 μ.Α. Part A How many protons are striking the detector per second? N = Submit 5 ΑΣΦ Request Answer ? protons per second