- $4.6\textrm{ fm}4
- $0.61$

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This is College Physics Answers with Shaun Dychko. To calculate the radius of a nucleon, we use this formula—<i>r naught</i> times the mass number to the power of one-third. For nickel 58, there are 58 nucelons so that's the mass number, we raise that to the power of one-third multiplied by <i>r naught</i> which is 1.2 femtometers and this gives 4.6 femtometers. And then in part (b), we are asked to figure out the ratio of the radius of the nickel nuclide to the radius of the hahnium nuclide. So that's <i>r naught</i> times the mass number of nickel to the power of one-third divided by <i>r naught</i> times the mass number of hahnium to the power of one-third. The <i>r naught</i>'s cancel and we can take this fraction and raise it all to the power of one-third. So that's 58 divided by 258 to the power of one-third which is 0.61.