Ruth Nat

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Published on October 13, 2007

Author: Gourangi

Source: authorstream.com

Ernest Rutherford :  Ernest Rutherford Personal Life:  Personal Life Born: August 30th,1871 in Spring Grove, New Zealand Died: October 19th,1937 in Cambridge His ashes were buried in Westminster Abbey next to Sir Isaac Newton's tomb He had 5 sisters and 6 brothers, he was the 4th born Married Mary Newton in 1900, They had one child, Eileen in 1901 He was knighted in 1914 and became First Baron Rutherford of Nelson in 1931 Graduated from Canterbury College, University of New Zealand with an M.A. in Mathematics, Mathematical Physics and Physical Science (Electricity and Magnetism) Interesting facts:  Interesting facts Although Rutherford was a physicist he was awarded the Nobel Prize in Chemistry Two of his Brothers drowned in 1886 His nickname was Ern He played rugby throughout high school and college Died as the result of delays in operating on his partially strangulated umbilical hernia He has appeared on stamps in four countries, Sweden, Canada, Russia, and New Zealand Humble Ernest:  Humble Ernest He didn't put his name on a third of the papers reporting on radioactivity even though he initiated almost every investigation Often he would do the preliminary work then hand the topic to a student or colleague He never put his name on Geiger and Marsden's paper announcing large angle scattering of alpha rays, nor on Chadwick's paper announcing the neutron, nor on Cockcroft and Wilson's paper announcing the splitting of the atom using a particle accelerator He helped Chadwick, Blackett, Cockcroft and Walton towards their nobel prizes Honours:  Honours Awarded the Rumford Medal (1905), Nobel Prize (1908), Copley Medal (1922) of the Royal Society, Bressa Prize (1910) of the Turin Academy of Science, Albert Medal (1928) of the Royal Society of Arts, Faraday Medal (1930) of the Institution of Electrical Engineers, the D.Sc. degree of the University of New Zealand, and honorary doctorates from the Universities of Pennsylvania, Wisconsin, McGill, Birmingham, Edinburgh, Melbourne, Yale, Glasgow, Giessen, Copenhagen, Cambridge, Dublin, Durham, Oxford, Liverpool, Toronto, Bristol, Cape Town, London and Leeds Discoveries and Achievements:  Discoveries and Achievements He was the first scientist to identify a nuclear bombardment reaction Explained radioactivity Helped Date the age of Earth Detection of electromagnetic waves over several hundred meters Discovered Radon Discovered Alpha, Beta, and Gamma Rays Became the world's first successful alchemist, changing nitrogen into oxygen i.e. he splits the atom Demonstrated the principle which is the basis of the modern smoke detector. Invented the Rutherford-Geiger detector of single ionizing particles Predicted the existence of the neutron Slide7:  Rutherford‘s proposed New Model Plum Pudding Model Slide8:  Alpha particle sometimes get close enough to the tiny nucleus to be the deflected. Both carry a positive charge so they repel each other. A few alpha particles make a “direct hit” (on the nucleus) it then repels an alpha particle backwards. His idea still stands today Slide9:  Ernest Rutherford thought of it like a miniature solar system, electrons move around the nucleus, like planets move around the sun. This idea is a little inaccurate because it is impossible to know exactly where an electron is at any given time. Atom:  Atom The nucleus is in the center of an atom and the electrons move in the space around it. But the electrons do not orbit the nucleus in the exact same path. Scientist often picture an atom like this, indistinct clouds around nucleus Gold Foil Experiment:  Gold Foil Experiment Atomic Theory:  Atomic Theory The atom has a central positive nucleus surrounded by negative orbiting electrons. There is an equal pull of both positive and Negative so when passing through the two nothing happened. His conclusion was that most of the atom is ‘empty space’ How small are an atom’s nucleus and electrons?:  How small are an atom’s nucleus and electrons? Imagine an atom the size of a football field stadium. The Nucleus would be smaller than a dime in the center of the field. Electrons would be the size of the eye on the dimes portrait of Franklin Roosevelt “It is worth pondering that an atom the building block of all matter in the universe-is mostly empty space.”

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