Lect14 -- Nuclear Principles

000000 instead its 082 higher puzzle 1 what could

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Unformatted text preview: 0.0032914 all together: 12.09894 Wait, this isn’t 12.000000 – instead it’s 0.82% higher!! Puzzle #1: what could possibly lower the mass so that 12C is 12.000000 a.m.u.? The puzzles of the atom Puzzle #1: what could possibly lower the mass of 12C so that it is 12.000000 a.m.u.? Puzzle #2: the nucleus is made of positively charged protons, but we know that like charges repel each other… so why doesn’t the nucleus fall apart? The puzzles of the atom Puzzle #2: the nucleus is made of positively charged protons, but we know that like charges repel each other… so why doesn’t the nucleus fall apart? •  There must be a force holding the nucleus together! •  This must be stronger than the electromagnetic force that repels the protons •  It must operate over only short distances – so that it can be very strong (enough to hold nucleus together) but not observable at long distances •  It is called the “STRONG FORCE” Puzzle #1: what could possibly lower the mass of 12C so that it is 12.000000 a.m.u.? The puzzles of the atom Puzzle #2: the nucleus is made of positive...
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This document was uploaded on 12/05/2013.

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