Explain the process of controlled and uncontrolled chain reactions.

1.	Explain the process of controlled and uncontrolled chain reactions.
Answer» Solution :Controlled chain reaction (i) In the controlled chain reaction the number of neutrons released is maintained to be one. This is ACHIEVED by absorbing the extra neutrons with a neutron absorber leaving only one neutron to produce further fission. (ii) Thus, the reaction is sustained in a controlled manner. The energy released due to a controlled chain reaction can be utilized for constructive purposes (iii) Controlled chain reaction is used in a nuclear reactor to produce energy in a sustained and controlled manner. Uncontrolled chain reaction In the uncontrolled chain reaction the number of neutrons multiplies indefinitely and causes fission in a large amount of the FISSILE material (ii) This results in the release of a huge amount of energy within a FRACTION of a SECOND. (iii) This kind of chain reaction is used in the atom bomb to produce an explosion .

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