This makes a long chain of reactions, known as, fission chain reaction. This process of propagation continues in powers of 3 like 3, 9, 27, 81, etc. These 9 electrons then undergo similar reactions until a large bulk of neutrons is produced after some consecutive reactions. When neutrons are bombarded on uranium-235, it breaks it into barium (Ba) and krypton (Kr) along with releasing three neutrons.Įach of these three neutrons strikes another uranium-235 nucleus which results in the emission of 9 neutrons. This lost mass converts into a great amount of energy that is about 2.5 million times greater than the energy produced by the same amount of coal. This mass corresponds to the binding energy of the system. This loss is about 0.2 amu per uranium atom. The above fission reactions show a minute decrease in the overall mass of products. The products that are formed as the result of fission are known as fission products.įor example, uranium 235 can undergo fission reaction in the following ways The splitting of a heavy nucleus into two or more daughter nuclei is called a fission reaction. This unstable nucleus splits into daughter nuclei and releases further neutrons and a large amount of energy. For example, uranium-235 absorbs a neutron and becomes a compound nucleus that is unstable. They observed that a heavy nucleus splits into daughter nuclei when neutrons are bombarded on it. In 1939, two scientists Hahn and Strassmann discovered fission. 1000000 oC Fission reactions can be controlled by control rods Fusion reaction, once started, cannot be controlled Released energy can be used for further process Released energy can not be used properly The products of fission reaction are radioactive Their products of fusion reaction are non-radioactive It is not a source of solar energy It is a source of solar energy It produces nuclear waste It does not produce nuclear waste at all Nuclear reactors and atomic bomb are examples of fission reaction CERN particle collider and hydrogen bomb are examples of fusion reaction Process of Nuclear Fission It requires extremely high temperature i.e.
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