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X rays are produced when a beam of electrons strikes a target. If $$n$$ electrons strike the target in one second, find (i) the beam current in an x ray tube. If electrons are accelerated by $$V$$ before striking the target, find the rate at which heat is produced in the target if $$90\%$$ of their kinetic energy is converted to heat.
Correct Answer: 0
PLACEHOLDER ANSWER - the question has two answers. The charge reaching the target each second is $$ne$$, so the beam current is $$I = ne$$. Each electron gains kinetic energy $$eV$$, so the beam brings $$neV$$ joules per second. With $$90\%$$ converted to heat, heat is produced at $$0.9\,neV$$ watts.
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