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.
The neutrons released in a fission reaction can be absorbed by other __________________ nuclei, starting other fission reactions, from which more neutrons are emitted. | |||
Right Option : A | |||
View Explanation |
Which of the following are correct ? (a) A reaction that continues on its own as one occurrence of the reaction triggers the next occurrence is called a chain reaction. (b) The rate of a chain reaction in the case of U235 can be controlled with materials that absorb protons. | |||
Right Option : A | |||
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 |
My experience with Abhyas is very good. I have learnt many things here like vedic maths and reasoning also. Teachers here first take our doubts and then there are assignments to verify our weak points.
One of the best institutes to develope a child interest in studies.Provides SST and English knowledge also unlike other institutes. Teachers are co operative and friendly online tests andPPT develope practical knowledge also.
My experience was very good with Abhyas academy. I am studying here from 6th class and I am satisfied by its results in my life. I improved a lot here ahead of school syllabus.
My experience with Abhyas academy is very good. I did not think that my every subject coming here will be so strong. The main thing is that the online tests had made me learn here more things.
It was a good experience with Abhyas Academy. I even faced problems in starting but slowly and steadily overcomed. Especially reasoning classes helped me a lot.
About Abhyas metholodology the teachers are very nice and hardworking toward students.The Centre Head Mrs Anu Sethi is also a brilliant teacher.Abhyas has taught me how to overcome problems and has always taken my doubts and suppoeted me.
Abhyas is a complete education Institute. Here extreme care is taken by teacher with the help of regular exam. Extra classes also conducted by the institute, if the student is weak.
I have spent a wonderful time in Abhyas academy. It has made my reasoning more apt, English more stronger and Maths an interesting subject for me. It has given me a habbit of self studying
It was good as the experience because as we had come here we had been improved in a such envirnment created here.Extra is taught which is beneficial for future.
Abhyas Methodology is very good. It is based on according to student and each child manages accordingly to its properly. Methodology has improved the abilities of students to shine them in future.