Power Systems
Advantages of pumped storage plants is/are

All of these
 operating time is minimum
 most economical as a peak load supply plant
 used as load frequency control

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Power Systems
Half life is defined as

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

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