A gold nucleus has a radius of 73 x10-15 m and a charge of, Ask an Expert

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A gold nucleus has a radius of 7.3 x10^-15 m and a charge of +79e. Through what voltage must an alpha-particle, with its charge of +2e, be accelerated so that it has just enough energy to reach a distance of 2.4×10^-14m from the surface of a gold nucleus? (Assume the gold nucleus remains stationary and can be treated as a point charge.)

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