Media Contributed by Rick

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RickStudent, Philosopher, Writer, Developer
Highslide JS
Paul Allen (left) with Bill Gates at Lakeside School in 1970 —
Photo Credit: By Bruce Burgess - Public Domain, https://commons.wikimedia.org/w/index.php?curid=89764229
Paul Allen (left) with Bill Gates at Lakeside School in 1970
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Paul G. Allen —
Photo Credit: By Miles Harris - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=73641437
Paul G. Allen
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An example of an induced nuclear fission event — A neutron is absorbed by the nucleus of a uranium-235 atom, which in turn splits into fast-moving lighter elements (fission products) and free neutrons. Though both reactors and nuclear weapons rely on nuclear chain reactions, the rate of reactions in a reactor is much slower than in a bomb.
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=486924
An example of an induced nuclear fission event A neutron is absorbed by the nucleus of a uranium-235 atom, which in turn splits into fast-moving lighter elements (fission products) and free neutrons. Though both reactors and nuclear weapons rely on nuclear chain reactions, the rate of reactions in a reactor is much slower than in a bomb.
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he Einstein–Szilard letter —
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=2679498
he Einstein–Szilard letter
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FDR response to the Einstein–Szilard letter —
Photo Credit: By Franklin Delano Roosevelt - Public Domain, https://commons.wikimedia.org/w/index.php?curid=2842619
FDR response to the Einstein–Szilard letter
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Albert Einstein and Leo Szilar —
Photo Credit: https://www.atomicheritage.org/profile/leo-szilard
Albert Einstein and Leo Szilar
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Neutron quark structure (ring-shape) —
Photo Credit: By No machine-readable author provided. Harp assumed (based on copyright claims). - No machine-readable source provided. Own work assumed (based on copyright claims)., CC BY-SA 2.5, https://commons.wikimedia.org/w/index.php?curid=637381
Neutron quark structure (ring-shape)
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A schematic diagram of the experiment James Chadwick used to discover the neutron in 1932 — At left, a polonium source was used to irradiate beryllium with alpha particles, which induced a type of uncharged radiation initially thought to be gamma rays. When this radiation struck paraffin wax, protons were ejected with ca. 5.5 MeV kinetic energy. The protons were observed using a small ionization chamber, called a counter, that detected a signal recorded on an oscillograph. Adapted from J. Chadwick, The Existence of a Neutron, Proc. Royal Society London, Series A, 136, 692-708, 1932.
Photo Credit: By Bdushaw - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=63982002
A schematic diagram of the experiment James Chadwick used to discover the neutron in 1932 At left, a polonium source was used to irradiate beryllium with alpha particles, which induced a type of uncharged radiation initially thought to be gamma rays. When this radiation struck paraffin wax, protons were ejected with ca. 5.5 MeV kinetic energy. The protons were observed using a small ionization chamber, called a counter, that detected a signal recorded on an oscillograph. Adapted from J. Chadwick, The Existence of a Neutron, Proc. Royal Society London, Series A, 136, 692-708, 1932.
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James Chadwick —
Photo Credit: By Los Alamos National Laboratory - Los Alamos National Laboratory, Attribution, https://commons.wikimedia.org/w/index.php?curid=36283260
James Chadwick
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Lise Meitner and Otto Hahn in 1912 —
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=90954251
Lise Meitner and Otto Hahn in 1912
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Otto Hahn —
Photo Credit: By Basch / Opdracht Anefo - Dutch National Archives, The Hague, Nederlands Persbureau (ANEFO), 1945-1989 bekijk toegang 2.24.01.04 Bestanddeelnummer 923-4491, CC BY-SA 3.0 nl, https://commons.wikimedia.org/w/index.php?curid=36966973
Otto Hahn
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