EINSTEINíS MASS ENERGY EQUATION
according to Einstein theory of relativity "Mass and Energy are inter convertable".
Einstein established a relation between mass and energy known as "Einsteinís Mass Energy Equation".
E = mc2
where            E = Energy
                    m = Mass
                    C = Velocity of light (3x108 m/sec)
Define nuclear fission and explain fission chain reaction.
 
DEFINITION OF FISSION
 
"The process in which a heavy nucleus in broken into two lighter nuclei
with the release of energy is called Nuclear Fission."

OR
The disintegration of a heavy nucleus after capturing neutron with
the release of energy is called "Nuclear Fission."
In one fission of 92u235 nucleus, about three neutrons are obtained.                                                   
FISSION IN 92u235
 
In 1939,Hann and Stressman discovered that fission can be produced by bombarding 92u235 with slow neutrons. When 92u235 is bombarded with neutron, it is broken down into two lighter nuclei and about 200Mev energy is released in this process.
EQUATION OF FISSION
 
0n1+92u235 Ť 92u236 Ť 56Ba144+36Kr90+30n1+energy
Along with the fission products i.e. barium and krypton, three neutrons are also obtained.
COLLISION GEOMETRY
 
Fission reaction in uranium can be explained by the following schematic diagram.
FISSION CHAIN REACTION
 
In one fission of 92u235 nucleus, about three neutrons are obtained. These fast moving neutrons undergo successive collision with the other 92u235 nuclei. As more and more nuclei are broken by the neutrons, more and more neutrons are obtained and an uncontrolled fission process is started which is referred to as FISSION CHAIN REACTION. If it is not controlled, then all the 92u235 atoms are broken and a large amount of energy is produced. An interesting fact which must be noted down is that no fission chain reaction will take place if the amount of uranium is less than a certain mass known as CRITICAL MASS.
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