Chain Reaction
Chain Reaction
Chain Reactions :
Suppose a slow neutron is absorbed by a nucleus of U-235 in a block of uranium. In the resulting U-236 nucleus fission takes place, and in the process 2 or 3 neutrons are emitted. These neutrons can be absorbed by other U-235 nuclei, starting other fission reactions, from which neutrons are emitted. In this way, the fission reaction continues by itself, without requiring any further external neutrons. One fission triggers another fission, in a self-sustaining sequence of fission reactions.
A reaction that continues on its own as one occurrence of the reaction triggers the next occurrence is called a chain reaction.
Which of the following are correct ? (a) In the chain reactions of fission of U-236 a slow neutron is absorbed by a nucleus of U-235 in a block of uranium. (b) The neutrons emitted during fission of U-236 can be absorbed by other U-235 nuclei, starting other fission reactions, from which more neutrons are emitted. | |||
| Right Option : C | |||
| View Explanation | |||
Which of the following are correct ? (a) When one fission of U-235 triggers another fission, is a self-sustaining sequence of fission reactions . (b) A reaction that continues on its own as one occurrence of the reaction triggers the next occurrence is called a chain reaction . (c) A chain reaction in 1 kg of U-236 will cause the fission of all its nuclei in less than one minute. | |||
| Right Option : A | |||
| View Explanation | |||
In a fission reactions a slow neutron is absorbed by a nucleus of ________________ in a block of uranium . | |||
| Right Option : B | |||
| View Explanation | |||
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