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2. The nuclear radius of gold is approximately r = 7.0 fm (1.0 fm = 1.0 × 10-15 m). The radii of protons and a
particles are 1.3 fm and 2.6 fm, respectively. (a) What energy a particles would be needed in head-on
collision for the nuclear surfaces to just touch? (This is about where the nuclear force becomes effective.)
(b) What energy protons would be needed?

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