Binding energy - the energy to take an atom apart

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Presentation transcript:

Binding energy - the energy to take an atom apart Unified Mass Units: (u) C 12 (neutral atom) = 12.0000000 u (defined) 1 u = 1.6605 x 10-27 kg = 931.5 MeV (show c = 2.998x108 m/s) Electron = .00054858 u (not useful) Proton = 1.007276 u (not useful) H (neutral atom) = 1.007825 u (very useful) Neutron = 1.008665 u (very useful)

Binding energy Example – Binding Energy of C-14 H (neutral atom) = 1.007825 u, Neutron = 1.008665 u 1 u = 931.5 MeV C 14 has a mass of 14.003242 u (Appendix B) (105.3 MeV)

Binding energy - the energy to take an atom apart H (neutral atom) = 1.007825 u (very useful) Neutron = 1.008665 u (very useful) 1 u = 931.5 MeV Binding energy in general Look neutral atom mass in Appendix B Break atom into H and n Subtract neutral atom mass from taken apart mass Multiply mass difference by 931.5 Mev/u

What is the binding energy for Nitrogen 13? (Z = 7) N 13 mass = 13.005739 u H = 1.007825 u Neutron = 1.008665 u 1 u = 931.5 MeV 94.11 MeV

What is the binding energy for Carbon 12? (Z = 6) C 12 mass = 12.000000 u (duh?) H = 1.007825 u Neutron = 1.008665 u 1 u = 931.5 MeV 92.16 MeV