Nuclear Power Engineering
Use of molten metal as a coolant in fast breeder reactor helps in

Accelerating the neutrons
Accelerating the reaction rate in the core
Breeding neutrons
Rapid heat transfer from the core

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Nuclear Power Engineering
The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life period of a radioactive substance is one month, then

3/4th of it will disintegrate in two months
It will completely disintegrate in four months
It will completely disintegrate in two months
L/8th of it will remain intact at the end of four months

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