Nuclear Power Engineering
The disintegration rate of a radioactive element

Progressively increases
Remains constant throughout
Progressively decreases
May increase or decrease depending on the material

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Nuclear Power Engineering
Molten sodium (as a coolant in fast breeder reactor)

Is highly radioactive at elevated temperatures and can cause explosion, when it comes in contact with air or water
Can't attain high temperature at normal pressure
None of these
Is not at all corrosive, even at a higher temperature

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