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It was the event when Al-Qaeda terrorist crashed two airplanes into the Twin Towers of the World Trade Center in New York City, killing everyone on board and many others working in the buildings
- Taco Bell was founded by Glen Bell -The first Taco Bell was built in Downey, California in 1962
-Konrad Zuse invented it - Z1 Computer, it was the first programmable computer
-A German physicist -He formulated an idea, that no experiment can measure the position and momentum of a quantum particle simultaneously. He created the "Heisenberg uncertainty principle." -Which implies that as one measures the certainty of the position of a particle, the uncertainty in the momentum gets correspondingly larger. Or, with an accurate momentum measurement, the knowledge about the particle's position gets correspondingly less.
-Austrian physicist -He had an interesting idea: Why not go all the way with particle waves and try to form a model of the atom on that basis? -His theory worked kind of like harmonic theory for a violin string except that the vibrations traveled in circles. -It proved difficult to form an accurate picture of an atom because nothing in our world really compares with it. -Schrödinger's wave mechanics did not question the makeup of the waves but he had to call it something so he gave it a symbol -The "psi" symbol of Schrödinger's wave came from the Greek lettering system.
-An Austrian physicist -Predicted that an electron should spin (kind of like a top) while it orbits around the nucleus. - Made the Pauli's exclusion principle -Which is when an electron has a certain set of quantum numbers, then no other electron in that atom can have the same set of quantum numbers. -It provides an important principle to this day and has even outlived the Bohr-Sommerfeld model that Pauli designed it for.
-A Frenchman -He thought that if light can exist as both particles and waves, why couldn't atom particles also behave like waves? -In a few equations derived from Einstein's famous equation, (E=mc2) he showed what matter waves would behave like if they existed at all.
-Danish -He was a student of Rutherford's Planetary Model -He pictured the electrons moving in a circular orbits of various fixed energy levels -Energy levels were the region around the nucleus where the electrons are likely to be moving -This only worked for hydrogen atoms
-From New Zealand -Chemist -He studied under JJ Thomson Gold Foil Experiment -Directed positively charged particles at a thin piece of gold foil -He expected it to pass straight through the foil -Surrounding the foil was a detector coated with a substance to produce flashes wherever the protons hit -Most particles passed right through the foil yet some bounced at large angles and straight backwards
-Englsih Physicist -Discovered electrons Cathode Ray Experiment -Involved the flow of eletrical current through glas -Sealed gasses into glass tubes with electrodes at the ends -The electrodes were connected to a high voltage source of electricity -One electrode was positivly charged and the other was negatively charged -When a magnet was placed near the cathode ray it deflected the beam away from the magnet Plum Pudding -Picture atom to be like plum pudding -Plum pudding= pudding with raisin -Spherical cloud of positvly charged with negative electrons scattered with in
In 1843 Michael Faraday studied to see if space could conduct electricity. This man lead to the cell phone development.
-It was the day America declared independence against Britain by signing the Declaration of Independence
-English school teacher -Thought of atoms as particles that might compose elements -Elements combine in the ratio of sall whole number -He developed the modern atom theory
-French chemist -showed that a given compound always contains the same proportion of elements by mass
-French chemist -He was the father of chemistry -Came up with the law of conservation of matter -Experimented and measured the masses of reactants and products of various reactions
-Greek -He said matter was made of small invisible parts -Atom in greek is atomos -He had no proof for his theory
-Greek -He rejected the idea of atoms -He thought the world was made of four elements -Earth, wind, water and fire -His reasoning is from logic and observations
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