Fission - The splitting of a larger nucleus into two or more smaller ones., Fusion - Two smaller nuclei are combined to make one large nucleus, Critical Mass - The minimum amount of fissionable material needed to sustain a chain reaction., Trinity - The name of the test site where the first atomic bomb was dropped.  , Los Alamos - The name of the city in New Mexico where the atomic bomb was first developed., Manhattan - The name of the secret project which focused on developing the atomic bomb. "____ Project", Little Boy - The name of the Uranium based bomb dropped on Hiroshima on August 6,1945. (it was longer & skinnier of the two), Fat Man - The name of the Plutonium based bomb that was dropped on Nagasaki on August 9, 1945 (it was the "rounder" of the two), two - The number of bombs that were dropped on another country during war. , naturally - Radioactive decay happens _____. Humans have no influence over this process. , sun - Fusion happens naturally in the ___., hydrogen - The sun's energy comes from the fusion of four ___ nuclei into one helium nuclei. , helium - One nucleus of this element is produced when four H nuclei fuse together in the sun.., energy - Einstein realized that the mass that can't be accounted for during fission and fusion reactions was converted into a LOT of _____.  , speed of light - The variable "c" in Einstein's equation stands for "___"., more - Fusion releases MUCH ____ energy than fission. (more or less) , temperatures - Humans are attempting to develop fusion reactors but are having trouble controlling the extremely high ____ & pressures that are necessary to start the fusion reaction. , enriched - Naturally found chunks of uranium-238 must be "__" in order to obtain a higher percentage of U-235, the isotope used in fission., neutron - This subatomic particle collides with the unstable nucleus to start the fission reaction., humans - ____ must set up the conditions for a fission reaction to occur. It won't happen naturally.,

3-1 Crossword: Fission & Fusion

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