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7. If the radius of the nucleus R = 1.2x 10^-13 cm, and known it is 1 fermi = 10^-13 cm, the nuclear radius of the ¹²C carbon atom is

a. 1.2 fermi

b. 2.7 fermi

c. 3.6 fermi

d. 1.7 fermi

e. 2.2 fermi

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