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hydrogenic materials are used as moderators in nuclear reactors to slow down the neutrons. why?
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Asked 9/24/2012 9:26:16 AM
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User: hydrogenic materials are used as moderators in nuclear reactors to slow down the neutrons. why?

Weegy: It is because neutrons from fission have very high speeds and must be slowed greatly by water "moderation" to maintain the chain reaction. The water moderator is necessary in the uranium fission reactors. [ Loss of the water coolant kills the chain reaction since the fuel configuration is not "critical" without water moderation. ]
rhey22787|Points 1181|

User: what is parallactic second?





Weegy: Parallactic second. It is a unit for measuring the distance of stars from earth
Expert answered|migzptz|Points 6669|

User: can there be a situation in which (total - initial)<0.explain.

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Asked 9/24/2012 9:26:16 AM
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