Nuclear Power Engineering
A boiling water reactor is the one, in which the

Coolant water, after being heated in the reactor core, generates steam in a boiler
Pressurised water is pumped into the core
Coolant water is allowed to boil in the core of the reactor
Fuel and the coolant are thoroughly mixed to form a homogeneous solution

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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

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

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