Power Plant Engineering
When a reactor becomes critical, then the production of neutrons is

Zero
Infinite
Exactly balanced by the loss of neutrons through leakage
Initiated

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Power Plant Engineering
In nuclear fission

None of the listed here
The original elements change into completely different elements
The electrons of the element change
The molecules rearrange themselves to form other molecules

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Power Plant Engineering
Isotopes of same elements have

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

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