a very brief history of time
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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. - PowerPoint PPT PresentationTRANSCRIPT
A VERY BRIEF HISTORY OF A VERY BRIEF HISTORY OF TIMETIME
By: Brian WilliamsBy: Brian Williams
What are “things” made of?What are “things” made of?
AristotleAristotle- four elements- four elements Earth, Water, Air, and FireEarth, Water, Air, and Fire
Atomic TheoryAtomic Theory- All things are made up of - All things are made up of small, indivisible pieces of matter called small, indivisible pieces of matter called atoms. Proposed by John Dalton in the atoms. Proposed by John Dalton in the early 1800’s.early 1800’s.
What makes “matter” move?What makes “matter” move?
Pre-Newton- Science was Pre-Newton- Science was descriptive, based on observationdescriptive, based on observation
Isaac Newton- Provided qualitative Isaac Newton- Provided qualitative descriptions of motion, developed descriptions of motion, developed three laws of motion; the father of three laws of motion; the father of “Classical Mechanics”“Classical Mechanics”
What is matter REALLY made What is matter REALLY made of?of?
Electron- Discovered in 1897 by J.J. Thomson, Electron- Discovered in 1897 by J.J. Thomson, using cathode rays. Thomson was able to measure using cathode rays. Thomson was able to measure e/m, and thus deduce the mass of the electron.e/m, and thus deduce the mass of the electron.
Nucleus- Discovered in 1910 by Ernest Rutherford Nucleus- Discovered in 1910 by Ernest Rutherford while doing experiments with alpha particles.while doing experiments with alpha particles.
Bohr ModelBohr Model- negatively charged electrons orbit a - negatively charged electrons orbit a small, positively charged nucleus, the atom small, positively charged nucleus, the atom consists of mostly empty space.consists of mostly empty space.
What’s the problem?What’s the problem?
The Bohr Model wasn’t consistent The Bohr Model wasn’t consistent with classical mechanics. with classical mechanics.
In fact, there was no way for classical In fact, there was no way for classical mechanics to explain the atom, so a mechanics to explain the atom, so a new theory was required!new theory was required!