Film: 1894

Science | 1950 | Sound | B/W

Synopsis:

A simple experiment which shows the effects neutrons have on the nucleus: a marble is slided down onto an empty saucer (nucleus), it jumps out 1950's

The saucer (nucleus) is filled with marbles (nucleus particles) and a marble (neutron) is slided down into the saucer, this saucer (nucleus) will become unstable and gives off excessive energy as beta and gamma radiation. If the marble (neutron) enters the saucer (nucleus) with a greater energy, one or more nucleus particles (marbles) will fly off, thus neutrons can also eject particles from the atom nucleus causing disintegration. Army marching in a large street. Mussolini. Hitler. Army marching. Hitler. A still of the front page of the Daily express. A group of 1939 atomic scientists. Professor Otto Frisch sits in an armchair in maybe a library, he expresses his concerns about the fact that uranium bombarded by neutrons gave rise to an isotope of barium, he also states that he was able to show experimentaly that the uranium nucleus sometime brakes into two halves and a great number of energy is released. A short animation describing uranium 92 and barium 56 in the periodic table. The reconstruction of Frisch's experiment : close up of the ionization chamber, a scientist places uranium in the ionization chamber, placed over the end of the bombarding tube (which sends high energy neutrons). The chamber is connected to an osciliscope. The trace seen on the oscilliscope is made by alfa particles emmited from the radioactive uranium. The scientists switch the high tension set on (to bombard the uranium with neutrons). The trace on the fission pulses on the oscilliscope reveal the large amount of energy released when uranium atoms are split.

View of the apparatus used to accelerate particles. A short animation describes atom fission by neutrons. War time images. War time atomic energy research laboratory, probably Los Alamos, U.S.A. A short animation describing a fast reaction to produce an atomic bomb from uranium 238 and uranium 235 (uranium 235 was first produced at the University of Chicago on the 2-12-1942), uranium 235 become bomb material number one, uranium behaviour gives rise to plutonium 239 which became bomb material number two. General view of probably Los Alamos, U.S.A. Scientists working on the production of the atomic pile (a component of the atomic bomb). A Los Alamos scientist working in the chemical laboratory. A group of Los Alamos scientists handle radioactive material (probably uranium 235 or plutonium 239) very carefully and without much body protection. A short shot of maybe a prototype or of maybe the actual first atomic bomb. Atomic bomb explosion. Another atomic bomb explosion (probably in Hiroshima). Images of Hiroshima after the atomic explosion.


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