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Ernest Rutherford By Lauren Kintzley and Brynn Reese.

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Presentation on theme: "Ernest Rutherford By Lauren Kintzley and Brynn Reese."— Presentation transcript:

1 Ernest Rutherford By Lauren Kintzley and Brynn Reese

2 ● Born August 30, 1871 in Nelson, New Zealand ● Attended Canterbury College and graduated in 1893 with a double first in Mathematics and Physical Science. He continued to study here and received his Bachelors in Science, and later to be awarded with a scholarship to Trinity College. ● Researched under J. J. Thomson and and in 1897 was awarded a research degree. From there, Ruthford went to Montreal, Canada and took the post of MacDonald Chair of Physics at McGill University. ● In 1907,Ruthford returned to England to become a professor of physics at Manchester and in 1919 he succeeded Thomson’s position as Cavendish Professor of Physics at Cambridge ● Died on October 19, 1937 in Cambridge Biography

3 · Starting sometime around 1909, Rutherford began to notice that alpha particles would not always behave in accordance to the plum pudding model of an atom when fired at a piece of gold foil. These observations stimulated further research that was eventually published in 1911 and has been known ever since as Rutherford's Gold Foil Experiment. Most Important Work

4 Rutherford aimed a beam of alpha particles at a piece of gold foil that was 8.6 x 10^(-6) cm thick. In relation to the plum pudding model the alpha particles should pass right through the gold foil. Gold Foil Experiment

5 For the most part, during the experiment, the particles passed right through the gold foil (further backing up the "empty space" in the plum pudding model) · However a few of the particles deflected about 1 or 2 degrees · Even more shockingly 1 in 20,000 particles would deflect 90 degrees or more or even right back at the experimenter · His experiment shows that the atom has a tiny, massive nucleus. He can say its tiny because it only deflects some of the time, so it can’t be that large. Results

6 · He postulated the nuclear structure of an atom. Experiments showed that when alpha particles are fired into gas atoms, a few are violently deflected, which implies a dense, positively charged central region containing most of the atomic mass-- the nucleus! Part in Atomic Theory

7 The Rutherford model of the atom was simplified in a well known symbol showing electrons circling around the nucleus like planets orbiting the sun. This symbol became popular and has been used by various organizations around the world as a symbol for atoms and atomic energy in general. Part in Atomic Theory


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