Fast neutrons can be slowed down by collisions with:
Correct answer: B. Protons
- A. Electrons
- B. Protons
- C. Phonons
- D. Photons
Explanation
A nuclear reactor is a device in which nuclear reactions are initiated,maintained,and controlled.It works on the principle of controlled chain reactions and provides energy at a constant rate.The moderator in a nuclear reactor slows down fast-moving secondary neutrons produced during fission.These moderators are rich in protons.When fast-moving neutrons collide head-on with the protons of moderator substances,their energies are interchanged, and thus the neutrons are slowed down.
This question appeared on the ETEA MDCAT 2006 paper, which you can sit online with every answer explained.
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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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