Question:
Which of the following elements is used as a moderator in nuclear reactors ?
Which of the following elements is used as a moderator in nuclear reactors ?
Show Hint
A moderator slows neutrons and should have a light nucleus that does not absorb neutrons easily.
Updated On: Nov 12, 2026
- Mg
- Be
- Ba
- Sr
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
A moderator slows down fast neutrons in a nuclear reactor so that they can cause further fission.
Step 2: Required Property
It should have a low atomic mass and a very low neutron absorption cross section.
Step 3: Apply to the Options
Among the alkaline earth metals given, beryllium is the lightest and absorbs very few neutrons. Mg, Ba and Sr are heavier or absorb more.
Step 4: Conclusion
Beryllium is the moderator, option (B).
Final Answer:
Beryllium is used as a moderator in nuclear reactors. \[ \boxed{\text{(B) }\text{Be}} \]
A moderator slows down fast neutrons in a nuclear reactor so that they can cause further fission.
Step 2: Required Property
It should have a low atomic mass and a very low neutron absorption cross section.
Step 3: Apply to the Options
Among the alkaline earth metals given, beryllium is the lightest and absorbs very few neutrons. Mg, Ba and Sr are heavier or absorb more.
Step 4: Conclusion
Beryllium is the moderator, option (B).
Final Answer:
Beryllium is used as a moderator in nuclear reactors. \[ \boxed{\text{(B) }\text{Be}} \]
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