Power Plant Engineering
Enriched uranium is required as a fuel in a nuclear reactor, if light water is used as moderator and coolant, because light water has

Low moderating efficiency
Low neutron absorption cross-section
High neutron scatter cross-section
High neutron absorption cross-section

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Power Plant Engineering
Isotopes of same elements have

Same chemical properties but different atomic numbers
Same atomic number and different masses
Different masses and different atomic numbers
Different chemical properties and same atomic numbers

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