Power Systems
Half life is defined as

 none of above.
  the time required for one half of isotope to decay.
 the time required to spiliting of a heavy nucleus.
 the time required for full of atoms in a specimen disintegrate.

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Power Systems
Critical mass is

 maximum mass of fissionable material required to sustain a chain reaction.
 none of these.
 a mass of fissionable material required to stop a chain reaction.
  minimum mass of fissionable material required to sustain chain reaction.

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