Lect14 -- Nuclear Principles

Nuclear fission fission splitting of an atom eg

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Unformatted text preview: out just how this all works, and why. Nuclear Fission Fission = splitting of an atom, e.g. uranium-235, that releases energy Atom splitting also releases neutrons Free neutrons cause other atoms to split – a chain reaction occurs In a nuclear power plant, the chain reaction is kept under control www.bio.miami.edu/beck/esc101/Chapter14&15.ppt The atom What is an atom? basic building block of all matter central nucleus surrounded by cloud of negatively charged electrons The nucleus made up of protons and neutrons proton has positive charge; mass = 1.007276 a.m.u. neutron has no charge; mass = 1.008665 a.m.u. proton by itself (hydrogen nucleus) will last forever neutron by itself will “decay” with a half-life of 10.4 min The atomic mass unit (a.m.u.) The a.m.u is based on 12C: 6 protons, 6 neutrons, 6 electrons defined to be 12.0000000000 a.m.u. If we add the constituent masses: protons: 6×1.00727647 = 6.04365876 neutrons: 6×1.008664923 = 6.051989538 electrons: 6×0.000548579909 =...
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This document was uploaded on 12/05/2013.

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