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An electron and a proton attract each other with a 1/r2 eleca tric 2 force, just like the gravitational force. Suppose that an elec tron moves in a circular orbit about a proton. (a) If the period of the circular motion is 24 h, what is the radius of the orbit? (b) If the period is 4 x 10 16 s, as it is in a hydrogen atom, what is the radius of the orbit? bel
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