# lecture27 - Physics 102 Lecture 27 Nuclear Binding...

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Nuclear Binding, Radioactivity Physics 102: Lecture 27  Make sure your  grade book  entries are correct! e.g. HOUR EXAMS, “EX” vs. “AB” EX = excused, AB = absent = 0 credit  Honors projects  are due May 3 via email: Word/PDF, file name to include your full name  Please fill out on-line ICES forms

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More important announcements No discussion next week! (Disc. 13) Lecture Wed. (May 5) will cover material Bring “Physics 102 problem solver” Come prepared! Quiz (put in TA mailbox by Friday, May 7) FINAL EXAM May 10 & 11 Review session Sunday May 9, 3pm, 141 Loomis
Hydrogen atom: Binding energy =13.6eV Binding energy of deuteron = or 2.2Mev! That’s around 200,000 times bigger!    2.2 × 10 6 eV Simplest Nucleus: Deuteron= neutron +proton neutron proton Very strong force Coulomb force electron proton Strong Nuclear Force (of electron to nucleus)

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ground state 2.2 MeV Deuterium Binding Energy
Nuclei have energy level—just like atoms 12 C energy levels Note the energy scale is MeV rather than eV energy needed to remove a proton from 12 C is 16.0 MeV energy needed to remove a neutron from 12 C is 18.7 MeV

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Comparing Nuclear and Atomic sizes Hydrogen Atom: Bohr radius =    5.29 × 10 - 11 m Nucleus with nucl number A:    r A 1/3 (1.2 × 10 - 15 m) Note the TREMENDOUS difference Smaller is Bigger! Nucleus is 10 4 times smaller and binding energy is 10 5 times larger! 13    13 27 Al has radius    r 3.6 × 10 - 15 m A Z
Preflight 27.2 Where does the energy released in the nuclear reactions of the sun come from?

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