Nuclei

Nuclei Decay Constant  Relation between half-life and decay constant:  Half-life  Relation between T and Tav T = 0.693 Tav Activity of a radioactive substance,  The activity of a radioactive substance can also be expressed in terms of its half-life. Activity, A = l N =  Nuclear Fission 92U235 + 0n1  [92U236]  56Ba141 + 36Kr92 + 30n1 + 200 MeV Atomic nucleus Volume of the nucleus A  mass number V =  Nuclear charge = Ze e = electronic charge Nuclear density Mass defect, D m = M - A m  actual mass of the nucleus. Packing fraction, f =  Mass-Energy Relation E = m c2 Total mass of protons and neutrons in the nucleus = Z MH + (A - Z) Mn Mass defect during the formation of the nucleus DM = [ZMH + (A - Z) Mn] - M Total binding energy of the nucleus is E = DM × c2 = [ZMH + (A - Z) Mn - M] × c2 joules Average binding energy per nucleon Binding energy of the nucleus is E = [ZMH + (A - Z) Mn - M] × 931.5 MeV