Ernest Rutherford


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Ernest Rutherford

  1. 1. Ernest Rutherford1st Baron Rutherford of Nelson The father of Nuclear Physics
  2. 2.  August 30, …Rutherford born on 1871and he died on October 19, 1937 in Brightwater, New Zealand.
  3. 3.  He conducted his experiment on……… 1911by Hans Geiger and Ernest Marsden at the suggestion of Ernest Rutherford. Geiger and Marsden expected to find that most of the alpha particles travel to straight trough the foil with little deviation, with a remainder being deviated by a percent or two.When did he conduct his experiment?
  4. 4. WHAT WAS HE TRYING TO PROVE W/ HIS EXPERIMENT? Rutherford proving about the existence of …….. Neutrons. It was named by James Chadwick. Which could somehow compensate for the repelling effect of the positive charges of protons by causing an attractive “nuclear force” and thus keep the nuclei from flying apart from repulsion between protons.
  5. 5. Summarize his experiment (what he did and what he discovered) Gold Foil Experiment
  6. 6.  The gold foil experiment consisted of a series of tests in which positively charged alpha particles (helium nuclei) were fired at a very thin sheet of gold foil. If Thomsons Plum Pudding model was to be accurate, the big alpha particles should have passed through the gold foil with only a few minor deflections. This is because the alpha particles are heavy and the charge in the "plum pudding model" is widely spread.
  7. 7.  In detail, a beam of alpha particles, generated by the radioactive decay of radon, was directed normally onto a sheet of very thin gold foil in an evacuated chamber. A zinc sulfide screen at the focus of a microscope was used as a detector; the screen and microscope could be swivelled around the foil to observe particles deflected at any given angle. Under the prevailing plum pudding model, the alpha particles should all have been deflected by, at most, a few degrees; measuring the pattern of scattered particles was expected to provide information about the distribution of charge within the atom.
  8. 8. Why was he surprised by hisexperimental results?• Bec. On his experiments, many of the alpha particles did pass through as expected, many others were deflected at small angles while others were reflected back to the alpha source.
  9. 9. How did his results fit w/Thomson’s view of the atom? Since none of Thomsons negative "corpuscles" (i.e. electrons) contained enough charge or mass to deflect alphas strongly, nor did the diffuse positive "pudding" or cloudlike positive charge, in which the electrons were embedded in the plum pudding model. Instead, Rutherford suggested that a large amount of the atoms charge and mass is instead concentrated into a very physically small (as compared with the size of the atom) region, giving it a very high electric field. Outside of this "central charge" (later termed the nucleus), he proposed that the atom was mostly empty space.
  10. 10. a number of tiny electrons circled the nucleus like the particles thenhypothesized to make up the ring around Saturn. By implication,Rutherfords concentration of most of the atoms mass into a very small core,made some type of planetary model an even more likely metaphor thanbefore, as such a core would contain most of the atoms mass, in an analogyto the Sun containing most of the solar systems mass.
  11. 11.  His beliefs were accepted until one scientist made an experiment regarding Rutherford’s experiment. He is Niels Bohr.
  12. 12.  /rutherford d_ernest.html ernest.asp
  13. 13. 5 Things you don’t know about…………Ernest Rutherford
  14. 14. #5Did you know that………The house where Rutherford was born in Brightwater was demolished in 1921?.. After years of neglect, the Rutherford Birthplace Project committee was formed to transform the site of original house into a national memorial to Lord Rutherford. The Rutherford Origin, with information displays about Rutherford in a garden setting, was opened on December 6, 1991.
  15. 15. #4Did you know that……….Rutherford worked on acoustic methods of detecting submarines?...... That was when he back in England, during the following years of the First World War.
  16. 16. #3Did you know that………..After graduating, he taught for a few weeks at Christchurch Boys’ High School……. but was not particularly successful as a teacher.
  17. 17. #2Did you know that………Rutherfords call for New Zealand institute for scientific research resulted in the establishment of the Department of Scientific and Industrial Research in 1926.
  18. 18. #1Did you know that…….Ernest Rutherford was a fiercly ANTI – NAZI?....Nazi was an organization that becomes an empire lately. When german refugees migrated in 1933, he served as president of the Academic Assistance Council, established to help them.
  19. 19. Questions1. What is his country of Origin?2-3. Complete the SentenceRutherford was the father of ______and 1st Baron Rutherford of ______.4. He conducted his experiment on___.5. What happened to the house in 1921 where Rutherford was born?6. Who proved that Neutrons exist?
  20. 20. 7. (Yes or No) Did Rutherford’s beliefs were accepted at that time?8. (True or False) Rutherford experiments gravity?9. (True or False) Rutherford was born on Brightwater, New Sealamb.10. Rutherford anti’s_______.
  21. 21. KEY TO CORRECTIONS1. New Zealand2-3. Nuclear Physics & Nelson4. 19115. Demolished6. James Chadwick7. Yes8. False9. False10.Nazi