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In a proton linear accelerator, a 8.4mA proton current hits a target.

(a) How many protons hit the target each second? N=5.3x10^16 proton/s

(b) How much energy is delivered to the target each second if each proton has a kinetic energy of 28MeV and loses all its energy in the target? U= 2.4x10^5J/s

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