If the nucleus is a few fm in diameter, the distance between the centers of two protons

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If the nucleus is a few fm in diameter, the distance between the centers of two protons must be ≈ 2 fm.

a. Calculate the repulsive electric force between two protons that are 2.0 fm apart.

b. Calculate the attractive gravitational force between two protons that are 2.0 fm apart. Could gravity be the force that holds the nucleus together?

c. Your answers to parts a and b imply that there must be some other force that binds the nucleus together and prevents the protons from pushing each other out. What characteristics of this force can you deduce from the discussion of the atom and the nucleus in this chapter?

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