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

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

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Nuclear Power Engineering
Commercial power generation from fusion reactor is not yet possible, because

Quantity of fuel required for initiating fusion reaction is prohibitively high
The fuel required (e.g. deuterium and tritium) is scarce
It is difficult to control fusion reaction
It is difficult to initiate fusion reaction

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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

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

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