Nuclear Power Engineering
The atomic mass of an element is fractional, because

It contains neutrons
It may have isotopes
Of uncertainty principle
It may have isobars

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Nuclear Power Engineering
A homogeneous reactor is the one, in which the

The fuel and the moderator is mixed to form a homogeneous material
Same substance (e.g. heavy water) is used as moderator & coolant
Fissile atoms are evenly distributed throughout the mass of nuclear reactor
All of these

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