06-Quantum_Mechanics

06-Quantum_Mechanics - Quantum Mechanics Biology190A...

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Quantum Mechanics Biology 190A Lecture 6 ‐‐‐ Prof. Steve Schneider Dept. of Astronomy
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What is a Quantum? quantum : (from Latin, meaning a share or portion) the smallest discrete quantity of some physical property; discrete, not continuous A “quantum jump” or “quantum leap” is a sudden change from one state to another – not smoothly continuous What is Mechanics? physics, echanics fers to studying and In physics, mechanics refers to studying and solving laws that describe how objects interact. o uantum mechanics escribes how the So quantum mechanics describes how the smallest of all objects behave and interact
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The First Quantum Theory Democritus and the Atomic Theory NOTHING EXISTS EXCEPT NOTHING EXISTS EXCEPT ATOMS AND ATOMS AND EMPTY EMPTY SPACE SPACE; EVERYTHING ELSE IS OPINION. ; EVERYTHING ELSE IS OPINION. —DEMOCRITUS OF ABDERA (~ 460–370 B.C.) For example, water can only be bdivided to some smallest subdivided to some smallest size unit which remains water. oday we would call that a Today we would call that a molecule (for water); elemental bstances (e g iron) break substances (e.g. iron) break down to atoms.
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Thomson and the Discovery of the Electron 1906 (1897) Could anything at first sight seem more practical than a body which is so Joseph John Thomson impractical than a body which is so small that its mass is an insignificant action of the mass of an atom of fraction of the mass of an atom of hydrogen? – which itself is so small that a crowd of these atoms equal in number to the population of the whole world would be too small to have been detected by any means then known to science.
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This note was uploaded on 11/22/2011 for the course BIOLOGY 190a taught by Professor Staff during the Fall '11 term at UMass (Amherst).

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06-Quantum_Mechanics - Quantum Mechanics Biology190A...

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