Question: How much voltage must be used to accelerate a proton (radius 1.2 X 10-15m) so that it has sufficient energy to just penetrate a silicon

How much voltage must be used to accelerate a proton (radius 1.2 X 10-15m) so that it has sufficient energy to just penetrate a silicon nucleus? A silicon nucleus has a charge of + 14e, and its radius is about 3.6 X 10-15m. Assume the potential is that for point charges.

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