-
322
Greek: Aristotle--dates for all greeks are in BC but timetoast won't let me do BC)
Aristotle dies. He believed that all objects were composed of a potential (matter) and a reality (form). Believed universe had no beginning or end--eternal. -
346
Greeks: Plato
Plato dies. He founded hte Academy. Used Empedocles element theort and identified each element with a regular solid. Fire=tetrahedron, air=actahedron, earth-=cube, water=icohedron. All properties of matter could be deduced thourgh thought w/o explanation. No experiments, just thinking. -
370
Greeks: Democritus
Democritus dies. Known for development of atomism to say taht atoms were solid bodies that were infinite in number, size, an shape, but could not be seen with naked eye. Thought everything emitted films of atoms and that our bodies recieved sensations from these. -
420
Greeks: Leucippus
Leucippus dies. Influnced by Zeno. THought there were 2 different elemdnts: full or solid and empty or void. His theory for atomism stated that there were infinite atoms ahtat exist and are responsible for special properties of matter. Agreed with Parmenides that w/o space for motion there can be no motion. -
432
Greeks:Empedocles
Empedocles dies. Belived that all things were made of 4 elements: Earth, Fire, Water, and Air:later developed by Aristotle and Plato. Conducted an experiment to show that air existed and wasn't just empt space(straw water example). He resasoned but didn't test that light traveled in finite velocity. -
460
Greeks: Democritus
Democritus born -
John Dalton
Dalton born -
US becomes a country
US declares indepenednce form Great Britain. -
Lord Ernest Rutherford Born
Nelson, New Zeland -
Dalton
Dalton died. He is best remembered for discovering the Atomic Theory. He created 3 laws. 1st law is law of Multiple Proportions which is the fixed ratio law. The of Definite Composition which states that a compound contrains 2 or more elements compined in a def. propor. of mass. (NH3 example) The Law of Conservation of mass states that mass can't be created or destroyed but it can be rearranged. -
Joseph James Thompson
Born in Cheetham Hill(suburb of Manchester,England) -
Planck
born -
Hantaro Nagaoka
born in Omer, Nagasaki Prefecture,Japan -
Millikan
born in Morrison, Illinois -
Thompson
enrolled at Queens College in Manchester -
Thompson
enrolled at Trinity College in Cambridge -
Thompson
Thompson was Cavendish Professor of Experimental Physics at Cambridge from 1884 to 1918. -
Thompson
elected Fellow of Royal Society -
Niels Bohr
born in Copenhagen, Denmark -
Erwin Schrodinger
born -
Rutherford
He was awarded a scholarship to attend University of New Zeland in Wellington and Canterbury College. -
James Chadwick
born in England -
Louis De Broglie
born in France -
Rutherford Graduates from College
Majors in Mathematics and Physical Science. He experimented with radioactive elements and found that they have a half-life and can then eventually turn into other stable elements. Also claimed rodioactive elemets produce alpha and beta rays. He later came up with a model of an atom after the discovery of a nucleus. -
Rutherford
Went to Trinity College, Cambridge and studied under JJ Thompson; recieved a B.A. Research Degree -
Thompson
archived original study of cathode rays culminating in discovery of the electron -
Rhtuerford
Joins Macdonald Chair of Physics at McGill University in Montreal, Canada -
Planck
E=h*f. Energy depends on frequency. E measured in J. Frequenct in Hz. h=Planck's constant in Joules per Hz(j-s). Planck's constant: 6.63x10^-34 j-s. Specific amt of energy required to knock electron out of orbit. -
Heisenberg
born -
Nagaoka
presented idea of kinetic theor of gases and the stability of Saturn's rings. Led to the question of electrons losing energy when they're constantly moving. To prove model=proving electrons aren't losing energy. The a more detailed model of an atom was realeased that agreed with Nagaoka. Proved electrons didn't loose energy as they went around the + nucleus. -
Rutherford
Returns to Europe to become a professor -
Rutherford
set up study to further knowledge on radiation. -
Thompson
knighted -
James Chadwick
attended Machester's University -
Rutherford
discovers atomic nucleus and developes atomic model. His atomic model is called the Planetary model with nucleus and orbiting electrons.Discovered proton and was first to make nuclear reaction. Mentored students rather than research himself. -
Millikan
prof at Univ of Chicago -
Planck
Head of Kaiser Wilhelm Society -
Chadwick
Graduation from Honours School of Physics -
Chadwick
offered scholarship to study in Germany. He studied nuclear science and was later involved in the Manhattan Project which developed the atomic bomb. -
Bohr
used Rutherford's model of atom as guide to study atomic structure -
Rutherford
Kinghted and thus becomes Lord Ernest Rutherford -
WWI
beginnig of war -
Rutherford
succeeded Sir Joseph Thompson -
Bohr
awarded Nobel Prize for Physics. He created a new model of the atom with the nucleus and the orbitals with electrons. For rest of life he develoed peacefully-used atomic energy and dabbled in microbio. -
Millikan
Nobel Prize for Physics to Millikan for Oil Drop experiment that was conducted from 1908 to 1917. Mist in chamber, hit with rays, attracted to + charged platechamber 1, electrons suspended in mid-air. Proved charge and size of electrons. -
Schrodinger
discobered his wave equation which come for a dissatifaction with Bohr's orbit theory. -
De Broglie
awarded Nobel Prize for discovery that light behaves as both a wave and a particle. -
Wall Street Crash of 1929
spark that started Great Depression -
Werner Heisenberg
wins Noble Prize for neutron-proton nucleus model. -
Chadwick
published book describing the proved existance of a neutron. He was awarded the Hughes Medal of the Royal Society in this same year. -
Schrodinger
shared Nobel Prize with Paul Dirac -
Chadwick
wins Nobel Prize -
Rutherford dies
ashes buried in Westminster Abbey. Won many awards including Nobel Prize. -
Beginnig of WWII
World War II begins -
Thompson
death date. recieved several awards and degrees form many institutions. -
Pearl Harbor Attack on US
Japanese bomb Pearl Harbor which throws the US into the Pacific Theatre of WWII -
Death of Hitler
Hitler commits suicide -
Planck
died -
Planck
Max Planck Society -
Nagaoka
death date -
Millikan
death date. -
Schrodinger
death from long illness. Famous for QMM. principal quantum number=n. Location of electrons around nucleus. Determines allowd energies and electron can have and how to find most prob. location of electron. -
Bohr
death date. Throughout life recieved several honorary docrorates from various universiteis such as Cambridge, Vienna, Oslo, Princeton, Harvard, etc. -
Chadwick
death date. Thoroughout his life he won several awards including the Nobel Prize for Physics in 1935 -
Heisenberg
died. Famous for uncertainty principle tht states that knowing exact position and momentum of electrons at the same time is impossible. -
Greeks: Aristotle
Aristotle born -
Greeks: Plato
born -
Greeks: Leucippus
Born -
Greeks: Empedocles
Born