Power Plant Engineering
In order to have constant chain reaction to produce a constant rate of heat output, the value of ratio of the number of neutrons in one generation to the number of neutrons in the immediately preceding generation must be

Less than 1.0
Equal to zero
Greater than 1.0
Equal to 1.0

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Power Plant Engineering
Isotopes of same elements have

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

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