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The energy of the thermal neutrons required for the fission of nuclei is of the order of 0.025 eV…
The energy of the thermal neutrons required for the fission of $^{235}\text{U}$ nuclei is of the order of 0.025 eV. However, the neutrons produced in the fission of $^{235}\text{U}$ possess quite large energy as compared to the energy of thermal neutrons. As these neutrons escape the $^{235}\text{U}$ block without causing the fission of $^{235}\text{U}$ nuclei. Due to this, in a nuclear reactor, it is important that the energy of neutrons is absorbed, and some neutrons are also absorbed.
Name the substance:
(a)
used to absorb the energy of the neutrons.
(b)
used for absorbing neutrons.
(c)
write condition when $^{235}\text{U}$ is said to be of critical size.
Answer
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From ISC 2025 Practice Physics, question 84.