Tick the correct statement_________________?
Correct answer: A. Moderators slow down the neutrons
- A. Moderators slow down the neutrons
- B. Moderators bring the neutrons to rest
- C. Moderators absorb the neutrons
- D. Moderators reflect the neutrons
Explanation
A moderator reduces the kinetic energy of fast neutrons through repeated collisions, bringing them to thermal energies suitable for sustaining fission. It does not normally absorb all the neutrons or bring them completely to rest. Students commonly choose 'absorb' because neutron absorbers are also used in reactors, but those are control rods rather than moderators.
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About Composition of Atomic Nuclei
Atomic nuclei contain positively charged protons and electrically neutral neutrons, collectively called nucleons. Questions use atomic number, mass number and nuclear notation to identify isotopes, isobars and isotones, and may connect nuclear composition with nuclear charge, mass defect, binding energy and the stability of the nucleus.
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