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A VERY BRIEF HISTORY OF TIME

A VERY BRIEF HISTORY OF TIME. By: Brian Williams. What are “things” made of?. Aristotle - four elements Earth, Water, Air, and Fire Atomic Theory - All things are made up of small, indivisible pieces of matter called atoms. Proposed by John Dalton in the early 1800’s.

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A VERY BRIEF HISTORY OF TIME

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  1. A VERY BRIEF HISTORY OF TIME By: Brian Williams

  2. What are “things” made of? • Aristotle- four elements • Earth, Water, Air, and Fire • Atomic Theory- All things are made up of small, indivisible pieces of matter called atoms. Proposed by John Dalton in the early 1800’s.

  3. What makes “matter” move? • Pre-Newton- Science was descriptive, based on observation • Isaac Newton- Provided qualitative descriptions of motion, developed three laws of motion; the father of “Classical Mechanics”

  4. What is matter REALLY made of? • Electron- Discovered in 1897 by J.J. Thomson, using cathode rays. Thomson was able to measure e/m, and thus deduce the mass of the electron. • Nucleus- Discovered in 1910 by Ernest Rutherford while doing experiments with alpha particles. • Bohr Model- negatively charged electrons orbit a small, positively charged nucleus, the atom consists of mostly empty space.

  5. What’s the problem? • The Bohr Model wasn’t consistent with classical mechanics. • In fact, there was no way for classical mechanics to explain the atom, so a new theory was required!

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