p44_013 - 13. (a) The electrostatic potential energy is...

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13. (a) The electrostatic potential energy is given by U = 1 4 πε 0 Z Xe Z Sr e 2 r Xe + r Sr where Z Xe is the atomic number of xenon, Z Sr is the atomic number of strontium, r Xe is the radius of a xenon nucleus, and r Sr is the radius of a strontium nucleus. Atomic numbers can be found either in Appendix F or Appendix G. The radii are given by r =(1 . 2fm) A 1 / 3 ,where A is the mass number, also found in Appendix F. Thus, r Xe =(1 . 2 fm)(140) 1 / 3 =6 . 23 fm = 6 . 23 × 10 15 mand r Sr =(1 . 2 fm)(96) 1 / 3 =5 . 49 fm = 5 . 49 × 10 15 m. Hence, the potential energy is
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