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Nuclear fission

3 Views· 02/05/24
Teacherflix
Teacherflix
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NUCLEAR FISSION: In our earlier session, we have learnt about nuclear process.Now let us learn about chain reaction in the nuclear process.A nuclear process in which a heavy nucleus, when bombarded with neutrons split into two nuclei of nearly equal mass along with release of enormous amount of energy is called as nuclear fission.In the above said process, every neutron can cause fission but along with the fission, it also releases 3 more neutrons on every fission reaction.Every neutron that is released can cause another fission reaction.Thus the three neutrons released in turn releases 9 neutrons.In the similar way, reaction continues and neutrons are built up in geometric progression and fission occurs till total uranium gets exhausted in a chain manner.This process is called as chain reaction and these reactions are called as Self-sustained series of fissions.The chain reaction: is a series of nuclear fissions whereby the neutrons produced in each fission cause additional fissions.There are two stages of chain reactions are there.Uncontrolled Chain reaction. Controlled Chain reaction. Uncontrolled chain reaction:In the chain reaction, there is no control on the number of fissions taking place and such reactions are called uncontrolled chain reaction.In this chain reaction more than one of the neutrons produced in a particular fission cause further fissions. So that the number of fissions increases very rapidly. Therefore an enormous amount of energy is released within a few millionths of a second and is released as a violent explosion. An average energy of about 200MeV Mega electron volts would be release per fission.Thus, an uncontrolled chain reaction can generate an incredible amount of energy within a very short time.This is actually what happens in an 'Atom Bomb'.Controlled chain-reaction:

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