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Atomic History Presentation: James Chadwick
Transcript of Atomic History Presentation: James Chadwick
Megan Wade Historical Background Early Life aethomoson12.blogspot.com
Born Oct 20, 1891 in Cheshire, England
Oldest son of three children
Parents: John Joseph and Anne Mary
Lived with grandmother and went to local school
Interested in math and physics Education
Chadwick first attended the Bollington Cross Primary School and the Central Grammar School for Boys in Manchester
He then attended Manchester High School before admittance to the universities of Manchester, Cambridge, and Berlin Technical
Graduated from Manchester with a M. Sc. degree in 1913, where he studied radioactivity
Studied under professors such as Hans Geiger and Ernest Rutherford Manchester University Scientific Contributions Historical Events: Country Historical Events: World What did he find? The United Kingdom, including (at the time): Britain, Ireland, Whales, and Scotland were an Allied Power during World War I
They fought against the Central Powers (the German Empire, the Austro-Hungarian Empire, and the Ottoman Empire)
Chadwick, however, was not in England at the time it was being attacked. Works Cited During, World War I (1914-1918) Chadwick was imprisoned in Germany at an internment camp near Berlin. While there he interned at a laboratory, where he worked on the ionization of phosphorus and the photochemical reaction of carbon monoxide. It wasn't until the end of the war (1918) that he was released to return back to England, and make his most important discovery yet. Chadwick discovered the first neutron in 1932
Neutron- a subatomic particle which does not contain an electrical charge (Mass- 1 AMU)
This was an essential building block to the nucleus of the atom Discovery Was influenced by the experiments of Frederic and Irene Joliot-Curie.
To replicate the experiments Chadwick smashed certain alpha particles into beryllium, and allowed the radiation from the collision hit another target: paraffin wax. The experiment results showed a collision with beryllium atoms would release a massive amount of neutral particles. Chadwick then named them neutrons. How did the Neutron Change the Model of the Atom? Significance Achievements + + + + + + + + + + + + + + - - - - - - Pre-Chadwick
Model + + + + + + + - - - - - - Chadwick
Model Chadwick's discovery of the neutron lead to... Understanding the structure of the nucleus
Nuclear Fission- High energy neutrons are needed to split atoms into smaller parts.
Nuclear Power- By splitting Uranium molecules with nuclear fission, the Uranium releases energy.
Nuclear Weapons- countries develop these weapons to be used in wars. Atomic Mass- Many scientists didn't understand how atoms could weigh so much with only protons and electrons. Nuclear Power Plant James Chadwick discovers the neutron 1932 Chadwick wins the Hughes Medal of the Royal Society 1932 Chadwick wins the Nobel Prize in Physics 1935 Worked in the United States as head of the British Mission for the development of the atomic bomb 1943-1946 Cain, Jeanette. "Biography: James Chadwick 1891-1974, Nobel Prize in Physics."Biography: James Chadwick 1891-1974, Nobel Prize in Physics. Frshosting.com, n.d. Web. 05 Nov. 2012.
"Chadwick Discovers the Neutron." PBS. PBS, 1998. Web. 05 Nov. 2012.
"Famous Scientists." James Chadwick. N.p., n.d. Web. 05 Nov. 2012.
"James Chadwick - Biography". Nobelprize.org. 08 Nov. 2012
"James Chadwick." James Chadwick. Soylent Communications, n.d. Web. 05 Nov. 2012.